Net proceeds from the sale of Care.com Proceeds from Divestiture of Businesses Unrealized gain (loss) on investment in MGM Resorts International Unrealized (gain) loss on investment in MGM Resorts International Unrealized gain (loss) on investment in MGM Resorts International Unrealized gain (loss) on investment in MGM Resorts International Unrealized Gain (Loss) on Investments Intangible assets Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Consolidated Balance Sheet Condensed Balance Sheet [Table Text Block] Expedia Other Affiliates [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Revenue, Segment Benchmark Revenue, Segment Benchmark [Member] Total cash provided by (used in) discontinued operations Cash Provided by (Used in) Discontinued Operation Restricted cash included in other current assets Restricted Cash, Current International Foreign Plan [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Related Party Transaction [Axis] Related Party Transaction [Axis] Entity File Number Entity File Number Additional Paid-in-Capital Additional Paid-in Capital [Member] Interest rate swaps Interest Rate Swap [Member] Tabular List, Table Tabular List [Table Text Block] Loss per share: Earnings Per Share, Basic [Abstract] FINANCIAL STATEMENT DETAILS PEOPLE INC. FINANCIAL INFORMATION Additional Financial Information Disclosure [Text Block] Issuance of common stock pursuant to stock-based awards, net of withholding taxes (in shares) Issuance of Common Stock, Shares, Pursuant to Stock-Based Awards, Net of Withholding Taxes Issuance of Common Stock, Shares, Pursuant to Stock-Based Awards, Net of Withholding Taxes Recent Accounting Pronouncements Not Yet Adopted by the Company New Accounting Pronouncements, Policy [Policy Text Block] Gain Contingencies [Line Items] Gain Contingencies [Line Items] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Schedule of Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Withholding taxes paid on IAC's transfer of Angi Inc. Class B shares to its former CEO Withholding taxes paid on behalf of employees on net settled stock-based awards Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic loss per share (USD per share) Loss per share attributable to IAC common stock and Class B common stock shareholders (USD per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Traffic acquisition costs and online marketing Traffic Acquisition Costs And Online Marketing Expense Traffic Acquisition Costs And Online Marketing Expense Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net earnings from discontinued operations attributable to noncontrolling interests Net earnings from discontinued operations attributable to noncontrolling interests Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest Liabilities: Liabilities, Fair Value Disclosure [Abstract] Net cash used in financing activities attributable to continuing operations Cash Provided by (Used in) Financing Activity, Continuing Operation Issuance of common stock pursuant to stock-based awards, net of withholding taxes Issuance of Common Stock Pursuant to Stock-Based Awards, Net of Withholding Taxes Issuance of Common Stock Pursuant to Stock-Based Awards, Net of Withholding Taxes Total other comprehensive (loss) income, net of income taxes Other comprehensive (loss) income, net of income taxes Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax (Loss) earnings per share from discontinued operations, net of income taxes, attributable to IAC common stock and Class B common stock shareholders (USD per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component Concentration risk (as a percent) Concentration Risk, Percentage Pension Pension Plan [Member] Other assets Increase (Decrease) in Other Operating Assets Stock-Based Compensation Expense Stock-Based Compensation Expense [Member] Stock-Based Compensation Expense Basis of Presentation Consolidation, Policy [Policy Text Block] Distribution from Angi Inc. pursuant to the tax sharing agreement Proceeds from Contributions from Affiliates Proceeds from the sale of an unutilized domain name Proceeds from Sale of Intangible Assets Long-term investments Total long-term investments Equity Securities Without Readily Determinable Fair Value And Other Long-Term Investments Equity Securities Without Readily Determinable Fair Value And Other Long-Term Investments Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Purchase of MGM Resorts International common shares Investment owned, cost Payments to Acquire Equity Method Investments Total IAC shareholders' equity Balance at beginning of period Balance at end of period Equity, Attributable to Parent Other comprehensive (loss) income, net of income taxes Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Stock-based compensation expense Stock-based compensation expense Share-Based Payment Arrangement, Expense Common stock authorized (in shares) Common Stock, Shares Authorized Digital Digital [Member] Digital Term Loan A-1 Facility Term Loan A-1 Facility [Member] Term Loan A-1 Facility TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Non-current liabilities Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] Certain Risks and Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Cash and cash equivalents and restricted cash at beginning of period Cash and cash equivalents and restricted cash at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Gain Contingencies [Table] Gain Contingencies [Table] Cover [Abstract] Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Print Print [Member] Print DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Payment received pursuant to the tax sharing agreement with Angi Inc. Adjustments To Additional Paid In Capital, Payment Received From Tax Sharing Agreement Adjustments To Additional Paid In Capital, Payment Received From Tax Sharing Agreement General and administrative expense General and Administrative Expense [Member] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Net earnings attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests [Member] This element represents that portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent. Capital expenditures Segment, Expenditure, Addition to Long-Lived Assets Accounting Policies [Abstract] Operating costs and expenses: Operating Costs and Expenses, Discontinued Operations [Abstract] Operating Costs and Expenses, Discontinued Operations Restricted Stock Restricted Stock [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Principal payments on the Term Loans Repayments of Secured Debt Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Treasury Stock Treasury Stock, Common [Member] Net loss from continuing operations Net loss attributable to continuing operations Net loss from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Accounts payable, trade Disposal Group, Including Discontinued Operation, Accounts Payable, Current Downward adjustments including impairments (gross unrealized pre-tax losses) Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount Voting agreement termination, threshold ownership percentage Voting Agreement, Termination, Threshold Ownership Percentage Voting Agreement, Termination, Threshold Ownership Percentage Retirement Benefits [Abstract] Changes in foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount LIABILITIES: Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] (Loss) earnings from continuing operations before income taxes Loss from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-current liabilities of discontinued operations Total non-current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Entity Shell Company Entity Shell Company Other long-term liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Net downward adjustments to the carrying value of equity securities without readily determinable fair values and net gains on sales of investments and businesses Gain (Loss) On Disposition Of Business, Investments And Upward (Downward) Adjustment On Equity Securities Without Readily Determinable Fair Value Gain (Loss) On Disposition Of Business, Investments And Upward (Downward) Adjustment On Equity Securities Without Readily Determinable Fair Value Operating Segments Operating Segments [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current portion of long-term debt Less: current portion of long-term debt Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Less: unamortized debt issuance costs Debt Issuance Costs, Gross Comprehensive (loss) income attributable to shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent RSA Agreement RSA Agreement [Member] RSA Agreement Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Restructuring accrued Restructuring Reserve Selling and marketing expense Disposal Group, Including Discontinued Operation, Selling and Marketing Expense Disposal Group, Including Discontinued Operation, Selling and Marketing Expense Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Basic loss per share (USD per share) Loss per share from continuing operations attributable to IAC common stock and Class B common stock shareholders (USD per share) Income (Loss) from Continuing Operations, Per Basic Share Award Type [Axis] Award Type [Axis] Noncurrent deferred revenue Contract with Customer, Liability, Noncurrent Foreign Currency Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Current liabilities Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] IAC Parent Company [Member] Legal Entity [Axis] Legal Entity [Axis] TOTAL ASSETS Assets Consolidated Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Adjustment to the Angi Inc. Distribution following the repeal of Canada's digital service tax Adjustment to the Angi Inc. distribution following the repeal of Canada's digital service tax Adjustments To Additional Paid In Capital, Investment Distribution Adjustment, Repeal Of Canada Digital Service Tax Adjustments To Additional Paid In Capital, Investment Distribution Adjustment, Repeal Of Canada Digital Service Tax Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Distribution of IAC's investment in Angi Inc. Distribution of Angi Adjustments To Additional Paid In Capital, Investment Distribution Adjustments To Additional Paid In Capital, Investment Distribution Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities attributable to continuing operations: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Stock-based compensation expense by function: Non Cash Compensation Expense by Function [Abstract] No definition available. THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Non-Google advertising revenue Advertising, Other [Member] Advertising, Other [Member] Other segment items Segment Reporting, Other Segment Item, Amount Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Elimination of Angi Inc. noncontrolling interest Noncontrolling Interest, Decrease from Deconsolidation Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Assets: Assets, Fair Value Disclosure [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Schedule of Capital Expenditures by Segment Schedule of Capital Expenditures by Segment [Table Text Block] Schedule of Capital Expenditures by Segment Adjustment of noncontrolling interests to redemption amount Adjustment of Redeemable Noncontrolling Interest to Fair Value Adjustment of Redeemable Noncontrolling Interest to Fair Value Investment in MGM Resorts International Investment in MGM Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Proportion of ownership interest held each by entity and by related party in another entity employing flight crew (as a percent) Percentage of Ownership Interest Held Each by Entity and by Related Party in Another Entity Employing Flight Crew Represents the percentage of the total purchase price of an aircraft paid by both the Company and a related party. Common stock outstanding (in shares) Common Stock, Shares, Outstanding Current period provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Restricted cash included in other non-current assets of discontinued operations Disposal Group, Including Discontinued Operation, Restricted Cash Disposal Group, Including Discontinued Operation, Restricted Cash Net gains on amendments and early terminations of lease agreements Gain on termination of lease Gain (Loss) on Termination of Lease Deferred revenue Disposal Group, Including Discontinued Operation, Deferred Revenue, Current Plan Name [Axis] Plan Name [Axis] Chief Executive Officer Chief Executive Officer [Member] Document Information [Table] Document Information [Table] PEO PEO [Member] Employee Severance Employee Severance [Member] Reversal of stock-based compensation expense related to individual Deferred Compensation Arrangement with Individual, Compensation Expense U.S. UNITED STATES Changes in assets and liabilities, net of effects of dispositions: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Current assets Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] Accumulated Deficit Accumulated Deficit Retained Earnings [Member] Existing Revolving Facility Existing Revolving Facility [Member] Existing Revolving Facility Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Total cash and cash equivalents and restricted cash as shown on the statement of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Unrecognized tax benefits, if subsequently recognized would reduce income tax expense Unrecognized Tax Benefits Unrelated To Federal Income Taxes Statute Of Limitations Expiring To Be Recognized In Subsequent Periods That Would Income Impact Tax Expense Continuing Operations Unrecognized Tax Benefits Unrelated To Federal Income Taxes Statute Of Limitations Expiring To Be Recognized In Subsequent Periods That Would Impact Income Tax Expense Continuing Operations. Income Statement [Abstract] Income Statement [Abstract] Income tax benefit (provision) Income Tax Expense (Benefit) Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate (Loss) earnings per share from discontinued operations, net of income taxes, attributable to IAC common stock and Class B common stock shareholders (USD per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Class B common stock Class B common stock Common Class B [Member] Deferred income taxes Disposal Group, Including Discontinued Operation, Deferred Tax Assets Document Information [Line Items] Document Information [Line Items] Intangible assets, net of accumulated amortization Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Customer concentration risk Customer Concentration Risk [Member] Variable Rate Component One Variable Rate Component One [Member] Variable Rate Component One Change in net unrealized gains (losses) on interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Basic loss per share (USD per share) Loss per share from continuing operations attributable to IAC common stock and Class B common stock shareholders (USD per share) Income (Loss) from Continuing Operations, Per Diluted Share Total IAC Shareholders' Equity Parent [Member] Net loss Net (loss) earnings Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Notional amount Derivative, Notional Amount Discontinued Operations and Disposal Groups [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Director replacement period Voting Agreement, Director Replacement Period Voting Agreement, Director Replacement Period Licensing and other revenue Licensing and Other [Member] Licensing and Other Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption rate (as a percent) Debt Instrument, Redemption Price, Percentage Accrued expenses and other current liabilities Accrued Liabilities, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash used in investing activities attributable to discontinued operations Cash Provided by (Used in) Investing Activity, Discontinued Operation Product development expense Disposal Group, Including Discontinued Operation, Research and Development Expense Disposal Group, Including Discontinued Operation, Research and Development Expense Schedule of Changes in Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash flows from investing activities attributable to continuing operations: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative expense General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Forfeiture of IAC's former CEO's restricted common stock award (in shares) Stock Issued During Period, Shares, 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[Abstract] Numerator: Diluted Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Equity Components [Axis] Equity Components [Axis] All other countries Non-US [Member] Non-session-based Non-Session-Based Services [Member] Non-Session-Based Services Schedule of Reconciliation of Adjusted EBITDA to Operating Income (Loss) Schedule of Reconciliation of Adjusted EBITDA to Operating Income [Table Text Block] Tabular disclosure of the reconciliation of Adjusted EBITDA to operating income [Table Text Block] Net cash used in financing activities attributable to discontinued operations Cash Provided by (Used in) Financing Activity, Discontinued Operation Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Concentration Risk [Table] Concentration Risk [Table] Unrealized Gains (Losses) On Interest Rate Swaps attributable to Noncontrolling Interest Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member] Accumulated Other Comprehensive (Loss) Income attributable to Noncontrolling Interest AOCI Attributable to Noncontrolling Interest [Member] Google Inc. Google Inc [Member] Represents the entity with which company has entered into a paid listing supply agreement for online advertising. Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Other Performance Measure, Amount Other Performance Measure, Amount Schedule of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Entity Address, State or Province Entity Address, State or Province Net (loss) earnings from discontinued operations attributable to IAC common stock and Class B common stock shareholders Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Non-current assets of discontinued operations Total non-current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Noncurrent Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Adjustments to the Carrying Value of Equity Securities Without Readily Determinable Fair Values Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract] MGM MGM [Member] MGM [Member] Per share information attributable to IAC common stock and Class B common stock shareholders: Earnings Per Share Reconciliation [Abstract] Other current assets Other Assets, Current Product development expense Research and Development Expense [Member] Additional paid-in-capital Additional Paid in Capital, Common Stock Entity [Domain] Entity [Domain] Total downward adjustments to equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount Other Restructuring Other Restructuring [Member] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Document Fiscal Year Focus Document Fiscal Year Focus Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] CONTINGENCIES Contingencies Disclosure [Text Block] Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Depreciation, Depletion and Amortization [Abstract] Depreciation, Depletion and Amortization [Abstract] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Plan Name [Domain] Plan Name [Domain] Other expense, net Disposal Group, Including Discontinued Operation, Other Income (Expense) Disposal Group, Including Discontinued Operation, Other Income (Expense) Condensed Income Statement [Table] Condensed Income Statement [Table] Corporate Aircraft Purchase Agreement Corporate Aircraft Purchase [Member] Corporate Aircraft Purchase [Member] Equity [Abstract] Equity [Abstract] General Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Stock-Based Compensation Expense Related to Modification of Awards Stock-Based Compensation Expense Related To Modification Of Awards [Member] Stock-Based Compensation Expense Related To Modification Of Awards Total upward adjustments to equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount Total cash provided by (used in) continuing operations Cash Provided by (Used in) Continuing Operation SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Quarterly repayments of principal Debt Instrument, Periodic Payment, Principal Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Google Services Agreement Google Services Agreement [Member] Google Services Agreement Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Other Temporary Equity, Other Changes Summary of Components of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Change in net unrealized losses on interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Cost of revenue (exclusive of depreciation shown separately below) Disposal Group, Including Discontinued Operation, Costs of Goods Sold Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangibles Amortization of intangibles Amortization of Intangible Assets Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Net loss from continuing operations attributable to IAC common stock and Class B common stock shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Condensed Financial Statements [Table] Condensed Financial Statements [Table] Other non-current assets Other Assets, Noncurrent Name of Major Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Consolidated Stockholders Equity Schedule of Stockholders Equity [Table Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Advertising revenue Advertising [Member] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Angi Angi [Member] ANGI Homeservices [Member] Deferred revenue Contract with Customer, Liability, Current Percentage of ownership interest in aircraft by subsidiary Percentage Of Ownership Interest In Aircraft By Subsidiary Percentage Of Ownership Interest In Aircraft By Subsidiary Segments [Axis] Segments [Axis] Stock-Based Compensation Expense Related to Acceleration of Employee Award Agreements Stock-Based Compensation Expense Related To Acceleration Of Employee Award Agreements [Member] Stock-Based Compensation Expense Related To Acceleration Of Employee Award Agreements Components of comprehensive income attributable to noncontrolling interests: Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other, net Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Variable Rate Component Two Variable Rate Component Two [Member] Variable Rate Component Two Expected restructuring costs Restructuring and Related Cost, Expected Cost ASSETS Assets [Abstract] Long-term debt, net Total long-term debt, net Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Cash, cash equivalents, and restricted cash included in current assets of discontinued operations Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Debt Instrument [Axis] Debt Instrument [Axis] PENSION AND POST-RETIREMENT BENEFIT PLANS Retirement Benefits [Text Block] FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Time deposits Bank Time Deposits [Member] Credit Facility [Domain] Credit Facility [Domain] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Interest rate swaps loss expected to be reclassified into interest expense with next twelve months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Product development expense Research and Development Expense Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Interest rate on debt instrument (as a percent) Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Operating income from discontinued operations Disposal Group, Including Discontinued Operation, Operating Income (Loss) Decrease in unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Foreign Currency Translation Adjustment attributable to Noncontrolling Interest Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] Redeemable noncontrolling interests Balance at beginning of period Balance at end of period Redeemable Noncontrolling Interest, Equity, Carrying Amount Capitalized software, leasehold improvements and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent IAC Inc. investment in People Inc. Other Long-Term Investments Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Schedule of Other Income, Net Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Intercompany due from People Inc. to IAC Inc. Intercompany Liability, Noncurrent Intercompany Liability, Noncurrent Depreciation Depreciation Depreciation, Nonproduction Title and Position [Domain] Title and Position [Domain] Total operating costs and expenses Expenses Costs and Expenses Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Reimbursement to IAC for settlement of equity awards held by employees Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Total Assets, Fair Value Disclosure Fair value of long-term debt Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Equity securities without readily determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Fixed cost allocation percentage Related Party Transaction, Fixed Cost Allocation Percentage Related Party Transaction, Fixed Cost Allocation Percentage Related Party [Axis] Related and Nonrelated Parties [Axis] Interest cost Defined Benefit Plan, Interest Cost Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net cash provided by (used in) operating activities attributable to continuing operations Cash Provided by (Used in) Operating Activity, Continuing Operation Net change primarily due to timing of collections and recognition Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Loss on the sale of Care.com, net of income taxes Less: Loss on the sale of Care.com, net of income taxes Less: Loss on the sale of Care.com, net of income taxes Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net cash provided by (used in) investing activities attributable to continuing operations Cash Provided by (Used in) Investing Activity, Continuing Operation Change in foreign currency translation adjustment attributable to noncontrolling interests Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Other, net Proceeds from (Payment for) Other Financing Activity Interest income Interest Income, Other Schedule of Adjusted EBITDA Schedule of Adjusted Earning Before Interest, Taxes, Depreciation And Amortization [Table Text Block] Schedule of Adjusted Earning Before Interest, Taxes, Depreciation And Amortization Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified to earnings Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Non-current assets Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other adjustments, net Other Noncash Income (Expense) Schedule of Long-term Investments Long Term Investments [Table Text Block] Long Term Investments Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Compensation Amount Outstanding Recovery Compensation Amount Face amount of debt instrument Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Beginning deferred revenue balance recognized during the period Contract with Customer, Liability, Revenue Recognized Retirement Plan Type [Domain] Retirement Plan Type [Domain] Income tax benefit (provision) Discontinued Operation, Tax Effect of Discontinued Operation Net pre-tax losses recognized Equity Securities without Readily Determinable Fair Value, Gain (Loss) Equity Securities without Readily Determinable Fair Value, Gain (Loss) Schedule of Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Project and other revenue Project and Other Print [Member] Project and Other Print Accumulated Other Comprehensive Income (Loss) AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Session-based Session-Based Services [Member] Session-Based Services Restricted cash included in other non-current assets Restricted Cash, Noncurrent Restructuring Type [Axis] Restructuring Type [Axis] Segment Reporting, Other Significant Reconciling Item Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Deferred income taxes Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities Number of types of anticompetitive conducts Gain Contingency, Allegation, Number Of Types Of Anticompetitive Conducts Gain Contingency, Allegation, Number Of Types Of Anticompetitive Conducts Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, 15,310 shares and 12,026 shares at March 31, 2026 and December 31, 2025, respectively Treasury stock Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Shares transferred (in shares) Deferred Compensation Arrangement with Individual, Shares Issued Selling and marketing expense Selling and Marketing Expense Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Other current assets Disposal Group, Including Discontinued Operation, Other Assets, Current Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Consolidated Statement of Operations and Comprehensive Income (Loss) Condensed Income Statement [Table Text Block] Unrealized gain (loss), impact in $2.00 change in share price Sensitivity Analysis Of Equity Securities, FV-NI, Unrealized Gain (Loss), Impact Of Two Dollar Change In Share Price Sensitivity Analysis Of Equity Securities, FV-NI, Unrealized Gain (Loss), Impact Of Two Dollar Change In Share Price Gain on sale of an unutilized domain name Gain on sale of an unutilized domain name Gain (Loss) on Disposition of Intangible Assets Litigation Case [Axis] Litigation Case [Axis] Accumulated Other Comprehensive (Loss) Income including portion attributable to Noncontrolling Interest AOCI Including Portion Attributable to Noncontrolling Interest [Member] Allocation of Angi Inc.'s cash in the Distribution Cash Divested from Deconsolidation Segments [Domain] Segments [Domain] Cumulative unrealized pre-tax gain Equity Securities, FV-NI, Cumulative Gain (Loss) Equity Securities, FV-NI, Cumulative Gain (Loss) Income Statement Location [Axis] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Cash and Cash Equivalent [Table] Cash and Cash Equivalent [Table] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Minimum Minimum [Member] Net (loss) earnings from discontinued operations attributable to IAC common stock and Class B common stock shareholders Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Diluted Allocation of certain tax attributes in connection with the Angi Inc. Distribution Adjustments To Additional Paid In Capital, Investment Distribution Tax Allocation Adjustments To Additional Paid In Capital, Investment Distribution Tax Allocation IAC Corporate Restructuring IAC Corporate Restructuring [Member] IAC Corporate Restructuring Buildings, equipment, leasehold improvements and capitalized software Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net loss from continuing operations attributable to IAC common stock and Class B common stock shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Company Selected Measure Name Company Selected Measure Name Newsstand revenue Newsstand [Member] Newsstand Senior Notes Senior Notes [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Realized pre-tax gains, net, for equity securities sold Equity Securities without Readily Determinable Fair Value, Realized Gain (Loss) Equity Securities without Readily Determinable Fair Value, Realized Gain (Loss) Employment Transition Agreement Employment Transition Agreement [Member] Employment Transition Agreement Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Discontinued Operations Discontinued Operations [Member] Net loss attributable to IAC common stock and Class B common stock shareholders Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Reimbursement to IAC for shares issued to settle People Inc. SARs Payment For Reimbursement Of Shares Issued To Settle Stock Appreciate Rights Payment For Reimbursement Of Shares Issued To Settle Stock Appreciate Rights Common stock, value Common Stock, Value, Issued Restructuring Plan [Domain] Restructuring Plan [Domain] Revenue Disposal Group, Including Discontinued Operation, Revenue Title and Position [Axis] Title and Position [Axis] Denominator for earnings per share—weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Comprehensive loss, net of income taxes Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Term Loan Loans Payable [Member] Entity Small Business Entity Small Business Depreciation Disposal Group, Including Discontinued Operation, Depreciation Disposal Group, Including Discontinued Operation, Depreciation Selling and marketing expense Selling and Marketing Expense [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Net earnings (loss) Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Noncontrolling Interests Noncontrolling Interest [Member] Loss related to the allocation of a disputed gain on a real estate transaction Loss Contingency, Loss in Period Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag NumberOfReportableSegmentsNotDisclosedFlag LONG-TERM DEBT Long-Term Debt [Text Block] Document Transition Report Document Transition Report Ownership interest in equity method investment (as a percent) Equity Method Investment, Ownership Percentage Schedules of Concentration of Risk, by Risk Factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Reportable Legal Entities Reportable Legal Entities [Member] Numerator: Basic Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Underlying Securities Award Underlying Securities Amount Concentration Risk [Line Items] Concentration Risk [Line Items] People Inc. People Inc. [Member] People Inc. Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment of noncontrolling interests to redemption amount Temporary Equity, Accretion to Redemption Value Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Schedule of Accumulated Depreciation and Amortization Schedule of Accumulated Depreciation and Amortization [Table Text Block] Schedule of Accumulated Depreciation and Amortization [Table Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Loss per share: Earnings Per Share, Diluted [Abstract] Balance at January 1 Balance at March 31 Accounts Receivable, Allowance for Credit Loss Common Stock Class A common stock Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Scenario [Axis] Scenario [Axis] Operating lease liabilities Increase (Decrease) in Operating Lease Liability Total shareholders' equity Balance at beginning of period Balance at end of period Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Investment in MGM Equity Method Investments, Fair Value Disclosure Level 3 Fair Value, Inputs, Level 3 [Member] LOSS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Other non-current assets Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Subscription revenue Subscription [Member] Subscription Product and Service [Axis] Product and Service [Axis] Domestic Plan Domestic Plan [Member] Derivative Contract [Domain] Derivative Contract [Domain] Revenue Revenues Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Capital expenditures Capital expenditures Payments to Acquire Property, Plant, and Equipment General and administrative expense Disposal Group, Including Discontinued Operation, General and Administrative Expense Name Forgone Recovery, Individual Name Total current assets Assets, Current People Inc. Ad-Tech Antitrust Litigation Against Google People Inc. Ad-Tech Antitrust Litigation Against Google [Member] People Inc. Ad-Tech Antitrust Litigation Against Google Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Net cash provided by operating activities attributable to discontinued operations Cash Provided by (Used in) Operating Activity, Discontinued Operation Accrued expenses and other current liabilities Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Disposal Group Classification [Axis] Disposal Group Classification [Axis] Weighted average fixed interest rate Debt, Weighted Average Interest Rate Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Withholding taxes paid on behalf of employees on net settled stock-based awards Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Proceeds held as escrow, amount Loss Contingency, Proceeds Held In Escrow Loss Contingency, Proceeds Held In Escrow Net loss attributable to IAC common stock and Class B common stock shareholders Net Income (Loss) Available to Common Stockholders, Basic Search Search [Member] Search [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Earnings from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Geographical [Axis] Geographical [Axis] Tax benefit on accumulated other comprehensive loss AOCI Tax, Attributable to Parent Proceeds from the sale of a portion of the retirement investment fund Proceeds From Sale Of Retirement Investment Fund Proceeds From Sale Of Retirement Investment Fund Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Diluted loss per share (USD per share) Loss per share attributable to IAC common stock and Class B common stock shareholders (USD per share) Earnings Per Share, Diluted Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Loss contingency, prior gain disputed Loss Contingency, Prior Gain Disputed Loss Contingency, Prior Gain Disputed Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Amortization of intangibles Disposal Group, Including Discontinued Operation, Amortization Disposal Group, Including Discontinued Operation, Amortization Treasury stock (in shares) Treasury Stock, Common, Shares Earnings Per Share [Abstract] Earnings Per Share [Abstract] Restructuring Plan [Axis] Restructuring Plan [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Per share information from continuing operations: Earnings Per Share, Basic and Diluted, Continuing Operations [Abstract] Earnings Per Share, Basic and Diluted, Continuing Operations Other income, net Other income, net Other income, net Nonoperating Income (Expense) Total Segment Adjusted EBITDA Adjusted EBITDA The Company's primary financial measure is Adjusted EBITDA, which is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and impairments of goodwill and intangible assets, if applicable, and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. The Company believes this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. Moreover, our management uses this measure internally to evaluate the performance of our business as a whole and our individual business segments, and this measure is one of the primary metrics by which our internal budgets are based and by which management is compensated. The above items are excluded from our Adjusted EBITDA measure because these items are non-cash in nature, and we believe that by excluding these items, Adjusted EBITDA corresponds more closely to the cash operating income generated from our business, from which capital investments are made and debt is serviced. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses. Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Deferred revenue Increase (Decrease) in Contract with Customer, Liability Net downward adjustments to the carrying value of equity securities without readily determinable fair values and net gains on sales of investments and businesses Long-term Equity Securities, And Divestiture Of Business, FV-NI, Gain (Loss) Long-term Equity Securities, And Divestiture Of Business, FV-NI, Gain (Loss) Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table] Segment, Reconciliation of Other Items from Segments to Consolidated [Table] Term Loan B-2 Facility Term Loan B-2 Facility [Member] Term Loan B-2 Facility Other Stockholders' Equity, Other Emerging & Other Emerging & Other [Member] Emerging & Other [Member] Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Variable Rate Component [Domain] Variable Rate Component [Domain] Variable Rate Component [Domain] Award Timing Disclosures [Line Items] Current assets of discontinued operations Total current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Debt balance outstanding Long-Term Debt, Gross Schedule of Realized and Unrealized Gains and Losses Gain (Loss) on Securities [Table Text Block] Recoveries collected Accounts Receivable, Allowance for Credit Loss, Recovery Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Angi Inc. Subsidiaries [Member] Revolving Facility Revolving Facility [Member] Revolving Facility Investment common shares owned (in shares) Investment Owned, Balance, Shares Net loss attributable to IAC shareholders Net income attributable to MGM Net (loss) earnings Net Income (Loss) Attributable to Parent Intersegment eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] SHAREHOLDERS' EQUITY: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Intercompany between People Inc. and IAC Inc. Payment Of Intercompany Transactions To Parent Payment Of Intercompany Transactions To Parent Schedule of Investment in MGM Equity Method Investments [Table Text Block] Buildings, land, equipment, leasehold improvements and capitalized software, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Purchases of treasury stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Entity Current Reporting Status Entity Current Reporting Status Unrealized pre-tax losses, net, on equity securities held Equity Securities without Readily Determinable Fair Value, Unrealized Gain (Loss) Equity Securities without Readily Determinable Fair Value, Unrealized Gain (Loss) Eliminations and Reclassifications Consolidation, Eliminations [Member] Major Customers [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating (loss) income Operating Income (Loss) Consolidated Entities [Domain] Consolidated Entities [Domain] Accumulated deficit Retained Earnings (Accumulated Deficit) Care.com Care.com [Member] Care.com [Member] Foreign Currency Translation Adjustment including portion attributable to Noncontrolling Interest Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Voting agreement, maximum number of directors Voting Agreement, Threshold Number Of Designated Directors Voting Agreement, Threshold Number Of Designated Directors Adjustment to the liquidation value of Vivian Health preferred shares Adjustments To Additional Paid In Capital, Adjustment To Liquidation Value Adjustments To Additional Paid In Capital, Adjustment To Liquidation Value Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Unrealized (Losses) Gains On Interest Rate Swaps Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Current liabilities of discontinued operations Total current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Retirement Plan Type [Axis] Retirement Plan Type [Axis] Other Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Interest rate swaps Derivative Liability Effect of exchange rate changes on cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net loss attributable to continuing operations to net cash provided by (used in) operating activities attributable to continuing operations: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities attributable to continuing operations: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Revenue Benchmark Revenue Benchmark [Member] Net (earnings) loss from continuing operations attributable to noncontrolling interests Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Total operating costs and expenses Disposal Group, Including Discontinued Operation, Operating Expense Balance at beginning of period (in shares) Balance at end of period (in shares) Shares, Issued Google advertising revenue Advertising, Google [Member] Advertising, Google [Member] Variable Rate [Domain] Variable Rate [Domain] Balance at January 1 Balance at March 31 Contract with Customer, Liability Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Voting agreement, threshold ownership percentage Voting Agreement, Threshold Ownership Percentage Voting Agreement, Threshold Ownership Percentage Number of aircraft operated Number of Aircraft Operated Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Denominator: Diluted Weighted Average Number of Shares Outstanding, Diluted [Abstract] Proceeds held as escrow, amount allocable to other party Loss Contingency, Proceeds Held In Escrow, Amount Allocable To Other Party Loss Contingency, Proceeds Held In Escrow, Amount Allocable To Other Party All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Post-Retirement Other Postretirement Benefits Plan [Member] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Termination Date Trading Arrangement Termination Date Performance marketing revenue Performance Marketing [Member] Performance Marketing Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Less: IAC Inc. entities excluding People Inc. Subsidiaries Excluding People, Inc. [Member] Subsidiaries Excluding People, Inc. Other non-current liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Total Equity Securities without Readily Determinable Fair Value, Annual Amount Equity Securities without Readily Determinable Fair Value, Annual Amount Unrecognized tax benefits, including interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Weighted average basic IAC common stock and Class B common stock shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Cost of revenue (exclusive of depreciation shown separately below) Cost of revenue Cost of Product and Service Sold Cost of revenue (exclusive of depreciation shown separately below) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Computation of Basic and Diluted Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Contract With Customer Liability [Roll Forward] Contract With Customer Liability [Roll Forward] Contract With Customer Liability Operating costs and expenses: Costs and Expenses [Abstract] Write-offs charged against the allowance Accounts Receivable, Allowance for Credit Loss, Writeoff 2032 Notes 2032 Notes [Member] 2032 Notes Non-cash lease expense (including right-of-use asset impairments) Operating Lease, Non-cash Lease Expense Operating Lease, Non-cash Lease Expense Less: original issue discount Debt Instrument, Unamortized Discount Accounts payable, trade Accounts Payable, Trade, Current Unrealized Gains (Losses) On Interest Rate Swaps including portion attributable to Noncontrolling interest Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Common stock issued (in shares) Common Stock, Shares, Issued Equity Securities without Readily Determinable Fair Values, Realized and Unrealized Gains (Losses) Equity Securities without Readily Determinable Fair Value, Realized Gains (Losses) [Abstract] Equity Securities without Readily Determinable Fair Value, Realized Gains (Losses) Accounts receivable, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Proportion of ownership interest held each by entity and by related party in aircraft employing flight crew (as a percent) Percentage of Ownership Interest Held Each by Entity and by Related Party in Aircraft Employing Flight Crew Represents the ownership interest in aircraft and entity employing aircraft flight crew that is held by both the reporting entity and a related party. Accounting Estimates Use of Estimates, Policy [Policy Text Block] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Income taxes payable and receivable Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Change in foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Corporate Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Other revenue Product and Service, Other [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Commitment fee (in basis points) Line of Credit Facility, Commitment Fee Percentage Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Related party transaction, shared security cost, percentage Related Party Transaction, Shared Security Cost, Percentage Related Party Transaction, Shared Security Cost, Percentage Net proceeds from the sales of investments and businesses Proceeds from Divestiture of Business and Sale of Long-term Investments Proceeds from Divestiture of Business and Sale of Long-term Investments Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Increase (Decrease) in Redeemable Noncontrolling Interests Increase (Decrease) in Temporary Equity [Roll Forward] Intangible assets, net Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent Earnings from discontinued operations, net of income taxes Less: Earnings from discontinued operations, net of income taxes Earnings from discontinued operations, net of income taxes Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Common Stock Common Stock [Member] Adjusted EBITDA, percentage generated in fourth quarter each year Adjusted EBITDA Generated In Fourth Quarter Each Year, Percent Adjusted EBITDA Generated In Fourth Quarter Each Year, Percent Net earnings (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase (decrease) in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment