Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Diluted shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Title of 12(b) Security Title of 12(b) Security Subsequent event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Loss (gain) on disposal of and impairment of long-lived assets Gain (Loss) on Disposal of and Impairment of Long-Lived Assets Gain (Loss) on Disposal of and Impairment of Long-Lived Assets Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Shares (RSU) Shares (Financial PSU) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Segment Reporting [Abstract] Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Common shares, €0.025 par value, 53,728,895 and 55,659,895 shares authorized and issued, and 48,550,453 and 51,151,866 outstanding at June 30, 2026 and December 31, 2025, respectively. Treasury shares repurchased Common Stock, Value, Issued Employee - related payables Employee-related Liabilities, Current Loss contingency accrual Loss Contingency Accrual Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Shares Class Of Warrant Or Right [Roll Forward] Class Of Warrant Or Right Treasury shares used for vesting (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Weighted-Average Grant date Fair Value Per Share Class Of Warrant Or Right, Weighted Average Grant Date Fair Value [Abstract] Class Of Warrant Or Right, Weighted Average Grant Date Fair Value Disposal of intangible assets, property and equipment Proceeds from Sale of Productive Assets Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Treasury stock acquired, average cost per share (in dollars per share) Shares Acquired, Average Cost Per Share Other creditors Other Sundry Liabilities, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Other cost of revenue Other Cost of Operating Revenue Loss Contingencies [Table] Loss Contingencies [Table] Noncash and nonoperating items Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item Performance share adjustment (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment, Weighted Average Grant Date Fair Value Leases [Abstract] Leases [Abstract] Total share-based payment expense Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value Total noncurrent liabilities Liabilities, Noncurrent Schedule of Investment Securities, Held-to-Maturity Debt Securities, Held-to-Maturity [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Granted, options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross PEO Total Compensation Amount PEO Total Compensation Amount Loss contingency, receivable Loss Contingency, Receivable Foreign currency translation differences, net of taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common shares par value (in euro per share) Common Stock, Par or Stated Value Per Share Reconciliation of cash, cash equivalents, and restricted cash to the consolidated statement of financial position Cash and Cash Equivalents [Abstract] Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Basic (in shares) Weighted average number of shares outstanding of Criteo S.A. 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stock-based compensation, stock options Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Basic shares: Weighted Average Number of Shares Outstanding, Basic [Abstract] Income taxes Accrued Income Taxes, Current Company Selected Measure Name Company Selected Measure Name Financial liabilities - current portion Financial Liabilities, Current Financial Liabilities, Current Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Dilutive effect of: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Patents infringed Number of Patents Infringed Number of Patents Infringed Due in one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Due in one to five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Noncash investing and financing activities Noncash Investing and Financing Items 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Stock, Ratio Conversion Of Stock, Ratio Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Net income available to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Deferred tax liabilities Deferred Income Tax Liabilities, Net Noncurrent financial assets Nontrade Receivables, Noncurrent Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Canceled (in shares) Class Of Warrant Or Right, Canceled During Period Class Of Warrant Or Right, Canceled During Period Defined contribution plan expenses Defined Contribution Plan, Cost Entity Small Business Entity Small Business Attributable to shareholders of Criteo S.A. 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Document Type Document Type 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] Fair Value as of Grant Date Award Grant Date Fair Value Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Goodwill [Table] Goodwill [Table] Other current assets Other Assets, Miscellaneous, Current Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Share-Based Payment Arrangement, Performance Shares, Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Income before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Number of geographical markets in which entity operates Number of Countries in which Entity Operates Performance share adjustment (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjustment Warrants term (in years) Warrants and Rights Outstanding, Term Intangible asset, finite-lived Intangible Asset, Finite-Lived, before Accumulated Amortization Schedule of Other Noncurrent Liabilities Other Noncurrent Liabilities [Table Text Block] Financial Performance Shares Units Previously Modified TSR PSUs Financial Performance Shares Units Previously Modified TSR PSUs [Member] Financial Performance Shares Units Previously Modified TSR PSUs Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Share Based Compensation Performance Shares Award Total Shareholder Return Unvested Activity Share Based Compensation Performance Shares Award Total Shareholder Return Unvested Activity [Table Text Block] Share Based Compensation Performance Shares Award Total Shareholder Return Unvested Activity Expired, options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Goodwill [Roll Forward] Goodwill [Roll Forward] Liabilities and shareholders' equity Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Beginning balance (in shares) Ending balance (in shares) Class of Warrant or Right, Outstanding Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Schedule of Defined Contribution Plan Defined Contribution Plan Disclosures [Table Text Block] Change in treasury stocks (in shares) Change in treasury stocks (in shares) Treasury Stock, Shares, Acquired PEO Name PEO Name Geographical [Axis] Geographical [Axis] Restricted cash, included in other current assets Restricted Cash Structured debt securities Structured Debt Securities [Member] Structured Debt Securities Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Other taxes Prepaid Other Taxes And Other Taxes Receivable Prepaid Other Taxes And Other Taxes Receivable Change in treasury stocks Treasury Stock, Value, Acquired, Cost Method Amounts paid Payments for Restructuring Net cash and cash equivalents and restricted cash at the beginning of the period Net cash and cash equivalents and restricted cash at the end of the period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Multicurrency Revolving Credit Facility Multicurrency Revolving Credit Facility [Member] Multicurrency Revolving Credit Facility Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Iponweb Iponweb [Member] Iponweb Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Equity awards compensation expense Share-Based Payment Arrangement, Noncash Expense Total operating lease expense Lease, Cost Indemnification asset Business Combination, Indemnification Asset, Acquisition Date, Amount Leases Lessee, Operating Leases [Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in USD per share) Basic earnings per share (in USD per share) Earnings Per Share, Basic Repurchase of treasury stocks Payments for Repurchase of Common Stock Total current assets Assets, Current Insider Trading Arrangements [Line Items] Term deposits Bank Time Deposits [Member] Short term lease expense Short-Term Lease, Cost Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Award Type [Axis] Award Type [Axis] Income taxes Prepaid Income Taxes Prepaid Income Taxes Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Trade receivables, net of allowances of $15.1 million and $25.9 million at June 30, 2026 and December 31, 2025, respectively. Net carrying value at end of period Accounts Receivable, after Allowance for Credit Loss, Current Amortization and provisions Depreciation, Depletion, Amortization And Provisions For Various Depreciation, Depletion, Amortization And Provisions For Various Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Share capital Common Stock [Member] Lease expense Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] Significant Accounting Policies Reclassification, Comparability Adjustment [Policy Text Block] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Currency translation adjustment Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] AlmondNet Inc and Intent IQ LLC AlmondNet Inc and Intent IQ LLC [Member] AlmondNet Inc and Intent IQ LLC Total equity and liabilities Liabilities and Equity Variable lease expense Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Schedule of Assumptions Used for Actuarial Valuations Defined Benefit Plan, Assumptions [Table Text Block] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Restructuring charges Restructuring Charges Schedule of Breakdown in Trade Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Other financial expense Other Nonoperating Income (Expense) Equity - attributable to shareholders of Criteo S.A. Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders' equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Entity Address, Country Entity Address, Country 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] Aggregate intrinsic value, options outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] General and administrative expenses General and Administrative Expense Financial PSU (PSUs) Financial PSU Financial Performance Shares Units [Member] Financial Performance Shares Units France FRANCE Aggregate Intrinsic Value (in thousands) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Aggregate Intrinsic Value Currency translation adjustment Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Acquisition of intangible assets, property and equipment Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Restructuring and Other Exit Costs Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Accounts payable relating to capital expenditures Accounts Payable, Capital Expenditures Accounts Payable, Capital Expenditures Income Taxes Income Tax Disclosure [Text Block] Contribution ex-TAC Gross Profit And Other Costs Of Revenue Gross Profit And Other Costs Of Revenue Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Other assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Name Trading Arrangement, Individual Name Unrecognized stock-based compensation, nonvested awards Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and Cash Equivalents Cash and Cash Equivalent Expected volatility of the benchmark Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Benchmark Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Benchmark Discount rate (Corp AA) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Schedule of Stock Options Roll Forward Schedule of Stock Options Roll Forward [Table Text Block] Company Selected Measure Amount Company Selected Measure Amount Net Income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Provision for income taxes Provision for Income taxes Income Tax Expense (Benefit) Foreign exchange income Gain (Loss), Foreign Currency Transaction, before Tax Traffic acquisition costs Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net 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 Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Performance Media Performance Media [Member] Performance Media Contingencies - current portion Loss Contingency, Accrual, Current Net income available to shareholders of Criteo S.A. Net income attributable to shareholders of Criteo S.A. Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Tranche 2 Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Financial income from cash equivalents Investment Income, Interest Actuarial losses (gains) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Uncertain tax positions Uncertain Tax Liability Uncertain Tax Liability Japan JAPAN Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Reduction in treasury shares (in shares) Treasury Stock, Shares, Retired Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]