Proceeds from disposal of investments Proceeds from Divestiture of Businesses Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Restatement [Axis] Revision of Prior Period [Axis] Debt Securities, Available-for-sale Debt Securities, Available-for-Sale [Table Text Block] Criteo Technology SRL Criteo Technology SRL [Member] Criteo Technology SRL Award Timing Predetermined Award Timing Predetermined [Flag] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Entity File Number Entity File Number Additional paid-in capital Additional Paid-in Capital [Member] Criteo MEA FZ-LLC Criteo MEA FZ-LLC [Member] Criteo MEA FZ-LLC [Member] Tabular List, Table Tabular List [Table Text Block] Recently Adopted Accounting Pronouncements and Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Shares Class Of Warrant Or Right [Roll Forward] Class Of Warrant Or Right Schedule of Financial Assets Fair Value, by Balance Sheet Grouping [Table Text Block] Structured debt securities Debt Securities [Member] French Research Tax Credit, Crédit d’Impôt Recherche (“CIR”) Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Share-Based Payment Arrangement Share-Based Payment Arrangement [Member] Goodwill [Line Items] Goodwill [Line Items] Iponweb GmbH Iponweb GmbH Switzerland [Member] Iponweb GmbH Switzerland Income eligible to reduced taxation rate Effective Income Tax Rate Reconciliation, Income Eligible To Reduced Taxation Rate Effective Income Tax Rate Reconciliation, Income Eligible To Reduced Taxation Rate HSBC and LCL Facilities HSBC and LCL Facilities [Member] HSBC and LCL Facilities [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] 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 Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other current assets Other Assets, Miscellaneous, Current Bidswitch Inc. Bidswitch Inc. [Member] Bidswitch Inc. Trade payables Increase (Decrease) in Accounts Payable, Trade Shared-based Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Intangible Asset, Indefinite-Lived [Table] Treasury shares used for vesting (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Total Current Income Tax Expense (Benefit) Adjustment to Compensation, Amount Adjustment to Compensation Amount 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 Consolidation Methods Consolidation, Policy [Policy Text Block] Equity awards compensation expense Share-Based Payment Arrangement, Noncash Expense 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 Stock options Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash, Cash Equivalents and Investment Securities Cash and Cash Equivalents, Policy [Policy Text Block] Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Equity attributable to shareholders of Criteo S.A. Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] Property and Equipment Property, Plant and Equipment [Table Text Block] Common shares authorized (in shares) Common Stock, Shares Authorized Issuance of ordinary shares (in shares) Stock Issued During Period, Shares, New Issues Other current liabilities Increase (Decrease) in Other Current Liabilities Reclassification, Type [Domain] Reclassification, Type [Domain] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Liabilities and shareholders' equity Liabilities and Equity [Abstract] Stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Options And BSPCE Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Stock Options Cover page. Cover [Abstract] Cash and Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] Average life of intangible assets (in years) Finite-Lived Intangible Asset, Useful Life CIR tax credits offset against R&D expenses CIR Tax Credits Offset Against R&D Expenses CIR Tax Credits Offset Against R&D Expenses Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Total Finite-Lived Intangible Assets, Net Restricted share awards Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Criteo Technology SAS Criteo Technology SAS [Member] Criteo Technology SAS Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Iponweb Labs LLC Iponweb Labs LLC [Member] Iponweb Labs LLC Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Amount capitalized Share-Based Payment Arrangement, Amount Capitalized Share-Based Payment Arrangement, Performance Shares, Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Prepaid Expenses and Other Current Assets Schedule of Other Current Assets [Table Text Block] Restructuring liability, beginning balance Restructuring liability, ending balance Restructuring Reserve Number of geographical markets in which entity operates Number of Countries in which Entity Operates Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Lease liability - operating - current portion Operating Lease, Liability, Current Document Fiscal Period Focus Document Fiscal Period Focus Expected rate of salary increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Accounts Receivables Receivable [Policy Text Block] Award Timing Method Award Timing Method [Text Block] Weighted-Average Remaining Contractual Term (Years) Class Of Warrant Or Right, Weighted Average Remaining Contractual Term [Abstract] Class Of Warrant Or Right, Weighted Average Remaining Contractual Term Litigation Case [Domain] Litigation Case [Domain] Furniture and fixtures Furniture and Fixtures [Member] Award Type [Axis] Award Type [Axis] Criteo S.A Parent Company [Member] Share-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Business combinations Business Combination [Policy Text Block] Valuation Allowance Release Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Issuance of shares under share option and free share plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Financial and Other Income (Expense) Financial And Other Income (Expense) [Policy Text Block] Financial And Other Income (Expense) Entity Address, City or Town Entity Address, City or Town Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Intangible assets Intangible Assets Disclosure [Text Block] Effect of exchange rates changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total Deferred Tax Assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount French Business Tax "Cotisation sur la Valeur Ajoutée des Entreprises" ("CVAE") Effective Income Tax Rate Reconciliation, Value Added Taxes, Amount Effective Income Tax Rate Reconciliation, Value Added Taxes, Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Sales and Operations Sales and Operations Expenses [Member] Sales and Operations Expenses Entity Emerging Growth Company Entity Emerging Growth Company Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 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] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Common shares outstanding (in shares) Common Stock, Shares, Outstanding Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Financial liabilities - current portion Financial Liabilities, Current Financial Liabilities, Current Trade Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] Current Tax Expense Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Decrease of valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Income taxes Accrued Income Taxes, Current 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] Schedule of Long-Lived Assets by Geographical Area Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Schedule of Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Due in one to five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Shares (RSU) Shares (PSU) Shares (TSR) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Servers and Networking equipment Servers And Networking Equipment [Member] Servers [Member] Provision for income taxes Provision for Income Taxes Income Tax Expense (Benefit) Criteo Canada Corp. Criteo Canada Corp. [Member] Criteo Canada Corp. [Member] Document Information [Line Items] Document Information [Line Items] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Gross book value at end of period Property, Plant and Equipment, Gross Due in one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Lock-up shares Lock Up Shares (LUSs) [Member] Lock Up Shares (LUSs) Criteo LLC Criteo LLC [Member] Criteo LLC [Member] Other current assets Increase (Decrease) in Other Current Assets Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Restructuring and Other Exit Costs Restructuring and Related Activities Disclosure [Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Change in income taxes Increase (Decrease) in Income Taxes Proceeds from exercise of stock options Proceeds from Stock Options Exercised Payment for businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Domestic Income Tax Paid, Federal, after Refund Received 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] Contingencies Commitments and Contingencies, Policy [Policy Text Block] Other Other differences Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Share warrants (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Unrecognized stock-based compensation, stock options Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Useful life (years) Property, Plant and Equipment, Useful Life Subsequent event Subsequent Event [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Foreign Income Tax Paid, Foreign, after Refund Received [Abstract] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Depreciation Money market funds Money Market Funds [Member] Software licenses, maintenance and bandwidth for servers Software Licenses, Maintenance and Bandwidth for Servers [Member] Software Licenses, Maintenance and Bandwidth for Servers Bidswitch GmbH Bidswitch GmbH [Member] Bidswitch GmbH Other Current and Noncurrent Liabilities Other Liabilities Disclosure [Text Block] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Sublease income Sublease Income Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Employee Benefits Compensation and Employee Benefit Plans [Text Block] Options expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Additional right of use assets Lessee, Operating Lease, Right Of Use, Asset, Lease Not yet Commenced, Assumption and Judgment, Value of Underlying Asset, Amount Lessee, Operating Lease, Right Of Use, Asset, Lease Not yet Commenced, Assumption and Judgment, Value of Underlying Asset, Amount Entity Address, Country Entity Address, Country Contractual Obligation, Fiscal Year Maturity Contractual Obligation, Fiscal Year Maturity [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total current liabilities Liabilities, Current Individual: Individual [Axis] Defined contributions plan expenses Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Decreases related to current year tax positions Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Document Annual Report Document Annual Report Research and Development Research and Development Expense [Member] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] 2027 Financial Liabilities, Due In Second Year Financial Liabilities, Due In Second Year Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Maximum percentage increase to target shares Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Percentage Increase To Target Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Percentage Increase To Target Shares Entity Interactive Data Current Entity Interactive Data Current Revenue Recognition and Cost of Revenue Revenue from Contract with Customer [Policy Text Block] Vested and exercisable (in shares) Class Of Warrant Or Right, Vested And Expected to Vest, Exercisable, Number Class Of Warrant Or Right, Vested And Expected to Vest, Exercisable, Number Shared-based Compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Schedule of Ownership Interests Schedule of Other Ownership Interests [Table Text Block] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Accounts receivable, previously written off, recovered Proceeds, Accounts Receivable, Previously Written off, Recovery Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Criteo Europa MM S.L. Criteo Europa MM S.L. [Member] Criteo Europa S.L. [Member] Marketable securities - noncurrent portion Marketable Securities, Noncurrent Vesting terms of Performance Stock Units Vesting Terms of Performance Stock Units [Member] Vesting Terms of Performance Stock Units Expired (in shares) Class Of Warrant Or Right, Expired During Period Class Of Warrant Or Right, Expired During Period Other noncurrent assets Other assets, noncurrent Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] 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] Curtailment Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Supplemental cash flow information Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Financial derivatives Financial Derivatives Financial Derivatives Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Tranche one Share-Based Payment Arrangement, Tranche One [Member] Financial instruments Financial Instruments Disclosure [Text Block] Ownership Interest Sale of Stock, Percentage of Ownership after Transaction Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Unrecognized stock-based compensation, nonvested awards Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Theoretical group tax-rates Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Foreign Foreign Income Tax Expense (Benefit), Continuing Operations Currency translation adjustment Accounts Receivable, Allowance For Doubtful Accounts, Currency Translation Adjustment Increase (Decrease) Accounts Receivable, Allowance For Doubtful Accounts, Currency Translation Adjustment Increase (Decrease) 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Weighted Average Remaining Lease Term And Discount Rates Weighted Average Remaining Lease Term And Discount Rates [Table Text Block] Weighted Average Remaining Lease Term And Discount Rates Vesting [Domain] Vesting [Domain] Term deposits Bank Time Deposits [Member] Criteo Reklamcılık Hizmetleri ve Ticaret Anonim Şirketi Criteo Reklamcılık Hizmetleri ve Ticaret Anonim Şirketi [Member] Criteo Reklamcılık Hizmetleri ve Ticaret Anonim Şirketi [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] Entity Address, Address Line One Entity Address, Address Line One Research and development expenses Research and Development Expense Accumulated other comprehensive (loss) income AOCI Attributable to Parent [Member] Trade receivables, allowances (Less) Allowance for doubtful accounts Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss, Current Criteo India Private Limited Criteo India Pvt Ltd (India) [Member] Criteo India Pvt Ltd (India) [Member] Schedule of Stock by Class Schedule of Stock by Class [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Aggregate Intrinsic Value (in thousands) Class Of Warrant Or Right, Aggregate Instrinsic Value [Abstract] Class Of Warrant Or Right, Aggregate Instrinsic Value Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] Prepayments to suppliers Prepayments To Suppliers Prepayments To Suppliers Changes in Unrecognized Tax Benefit Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Intangibles including capitalized R&D costs Deferred Tax Assets, Capitalized Research and Development Deferred Tax Assets, Capitalized Research and Development Schedule of Earnings Per Share, Basic Schedule Of Earnings Per Share, Basic [Table Text Block] Schedule Of Earnings Per Share, Basic [Table Text Block] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Other short-term lines of credit Bank Overdrafts [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted-average remaining contractual term, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Germany GERMANY Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Exercised (in shares) Exercised (in shares) Class Of Warrant Or Right, Exercised During Period Class Of Warrant Or Right, Exercised During Period Supplemental Cash Flow Information Supplemental Cash Flow Information [Table Text Block] Supplemental Cash Flow Information 2027 Derivative Liability, Due In Second Year Derivative Liability, Due In Second Year Non-PEO NEO Non-PEO NEO [Member] Aggregate intrinsic value, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Net operating loss carryforwards, subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Goodwill Goodwill Disclosure [Text Block] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Advertising expense Advertising Expense Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Deferred Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Schedule of Revenue by Geographic Area Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Iponweb Limited Iponweb Limited [Member] Iponweb Limited Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] 2028 Financial Liabilities, Due In Third Year Financial Liabilities, Due In Third Year Schedule of Investments [Line Items] Schedule of Investments [Line Items] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Statutory tax rate difference Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Other Current and Noncurrent Assets Other Assets Disclosure [Text Block] Net change in fair value of earn-out Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Weighted average shares outstanding used in computing per share amounts: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Criteo Ltd Criteo Ltd [Member] Criteo Ltd [Member] Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Criteo Srl Criteo Srl [Member] Criteo Srl [Member] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Sales and operations expenses Selling and Marketing Expense Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] EMEA EMEA [Member] Schedule of Earnings Per Share, Diluted Schedule Of Earnings Per Share, Diluted [Table Text Block] Schedule Of Earnings Per Share, Diluted [Table Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Company Selected Measure Name Company Selected Measure Name Uncertain Tax Positions Income Tax Uncertainties, Policy [Policy Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Operating cash flows for operating leases Operating Lease, Payments Cash flows from financing activities Cash Flow, Financing Activities, Lessee [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Impairment expense (excluding goodwill) Impairment of Intangible Assets (Excluding Goodwill) Contingencies - noncurrent portion Loss Contingency, Accrual, Noncurrent Foreign Current Foreign Tax Expense (Benefit) Criteo Nordics AB Criteo Nordics AB (Sweden) [Member] Criteo Nordics AB (Sweden) [Member] Goodwill [Roll Forward] Goodwill [Roll Forward] Restricted stock units and Performance stock units Restricted Stock Unit (RSUs) And Performance Shares Units (PSUs) [Member] Restricted Stock Unit (RSUs) And Performance Shares Units (PSUs) Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] Tranche two Share-Based Payment Arrangement, Tranche Two [Member] Diluted (in shares) Weighted average number of shares outstanding used to determine diluted earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Operating Segments Segment Reporting, Policy [Policy Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Domestic Current Federal, State and Local, Tax Expense (Benefit) Entity Small Business Entity Small Business Capitalized computer software, gross Capitalized Computer Software, Gross Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Interest and penalties associated with unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Criteo Australia Pty Ltd Criteo Australia Pty Ltd [Member] Criteo Pty [Member] Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Defined Contribution Plan Disclosures Defined Contribution Plan Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Income Taxes Income Tax Disclosure [Text Block] Purchase obligations Total Contractual Obligation UK UNITED KINGDOM Cash payment for contingent consideration Payment for Contingent Consideration Liability, Financing Activities Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Short term lease expense Short-Term Lease, Cost Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Treasury stock acquired, average cost per share (in dollars per share) Shares Acquired, Average Cost Per Share Document Type Document Type Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Product and Service [Axis] Product and Service [Axis] Number of shares granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Target Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Target Shares Spain SPAIN Variable lease expense Variable Lease, Cost Revenue Revenue from Contract with Customer, Excluding Assessed Tax Effect of Change in Accounting Estimate, Type [Domain] Effect of Change in Accounting Estimate, Type [Domain] Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure [Abstract] Contingencies - current portion Loss Contingency Accrual Authorized amount of share repurchase program Share Repurchase Program, Authorized, Amount 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 Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Aggregate intrinsic value of the share options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value France FRANCE Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Financial derivatives Derivative [Abstract] Marketable securities - current portion Marketable Securities, Current Schedule of 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 Current liabilities: Liabilities, Current [Abstract] Weighted-Average Remaining Contractual Term (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Total operating expenses Operating Expenses Level 1 Fair Value, Inputs, Level 1 [Member] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Trade receivables, net of allowances of $25.9 million and $28.6 million as of December 31, 2025 and December 31, 2024, respectively. 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The MediaGrid Inc. [Member] The MediaGrid Inc. Accounts payable relating to capital expenditures Accounts Payable, Capital Expenditures Accounts Payable, Capital Expenditures Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Schedule of Stockholders' Equity Note, Warrants or Rights Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Criteo Corp. 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Doobe In Site Ltd [Member] Doobe In Site Ltd Her Majesty's Revenue and Customs (HMRC) His Majesty's Revenue and Customs (HMRC) [Member] Financial income from cash equivalents Investment Income, Interest Noncash investing and financing activities: Noncash Investing and Financing Items [Abstract] 2030 Derivative Liability, Due In Fifth Year Derivative Liability, Due In Fifth Year Income Tax Paid, by Individual Jurisdiction [Line Items] Income Tax Paid, by Individual Jurisdiction [Line Items] US USA United States UNITED STATES Valuation Allowance Release Non recognition of deferred tax assets Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 2026 Derivative Liability, Due In Next Fiscal Year Derivative Liability, Due In Next Fiscal Year Retained earnings Retained Earnings [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Other Non-curent Assets [Table] Other Non-curent Assets [Table] Other Non-curent Assets Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] 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 Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Purchases of investment securities Payments to Acquire Marketable Securities Other Other [Member] Other Modification of service period Share Based Compensation Arrangement, Modification, Service Period Share Based Compensation Arrangement, Modification, Service Period Acquired technology Technology [Member] Technology Intangible assets, net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Product and Service [Domain] Product and Service [Domain] Criteo Singapore Criteo Singapore [Member] Criteo Singapore Equity - attributable to shareholders of Criteo S.A. Parent [Member] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Cash flows from operating activities Cash paid for amounts included in the measurement of lease liabilities : Cash Flow, Operating Activities, Lessee [Abstract] Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Table] Customer prepayments and deferred revenue Contract with Customer, Refund Liability, Current City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] General and administrative expenses General and Administrative Expense Long-lived assets Long-Lived Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Schedule of Stock Options Roll Forward Schedule of Stock Options Roll Forward [Table Text Block] Iponweb Labs Limited Iponweb Labs Limited [Member] Iponweb Labs Limited Criteo Holdings, Inc. Criteo Holdings, Inc. [Member] Criteo Holdings, Inc. 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Criteo Korea Ltd. (Korea) [Member] Criteo Korea Ltd. 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Restatement [Domain] Revision of Prior Period [Domain] Number of operating segments Number of Operating Segments Income Tax Examination [Table] Income Tax, Examination [Table] Schedule of Debt Schedule of Debt [Table Text Block] Criteo France SAS Criteo France SAS (France) [Member] Criteo France SAS (France) [Member] Granted (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Interest cost Defined Benefit Plan, Interest Cost Commerce Growth Commerce Growth [Member] Commerce Growth Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) Number of reporting units Number of Reporting Units Summary of restructuring activities included in other current liabilities Restructuring and Related Costs [Table Text Block] Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Change in other financing activities Proceeds from (Payment for) Other Financing Activity Name Trading Arrangement, Individual Name Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Common Stock, Shares Outstanding [Roll Forward] Common Stock, Shares Outstanding [Roll Forward] Common Stock, Shares Outstanding [Roll Forward] Name Awards Close in Time to MNPI Disclosures, Individual Name Pretax Income Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] Outstanding at beginning of period (in USD per share) Outstanding at end of period (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Amounts paid Payments for Restructuring Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Other Other Accrued Liabilities, Noncurrent Treasury shares issued for RSU vesting (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued Shared-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, 4,508,029 and 3,467,417 shares at cost as of December 31, 2025 and December 31, 2024, respectively. Treasury Stock, Value Country Region Country Region Litigation Case [Axis] Litigation Case [Axis] Foreign Tax Authority Foreign Tax Jurisdiction [Member] Auditor Firm ID Auditor Firm ID Total Shareholder Return (TSR) Total Shareholder Return (TSR) [Member] Total Shareholder Return (TSR) Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Total noncurrent assets Assets, Noncurrent Accumulated postretirement benefit obligation - beginning of period Accumulated postretirement benefit obligation - end of period Defined Benefit Plan, Benefit Obligation Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Change in operating lease liabilities and right of use assets Increase (Decrease) In Operating Lease Liabilities (Assets) Increase (Decrease) In Operating Lease Liabilities (Assets) Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Cost of revenue Cost of Revenue [Abstract] Number of tranches Number of Tranches Number of Tranches All Executive Categories All Executive Categories [Member] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Common shares, €0.025 per value, 55,659,895 and 57,744,839 shares authorized and issued, and 51,151,866 and 54,277,422 outstanding at December 31, 2025 and December 31, 2024, respectively. Common Stock, Value, Issued Criteo KK Criteo KK [Member] Criteo KK [Member] Other Non-curent Assets [Line Items] Other Non-curent Assets [Line Items] Other Non-curent Assets [Line Items] No Trading Symbol No Trading Symbol Flag Number of grantees affected by Share Based Compensation modification Number Of Grantees Affected By Share Based Compensation Modification Number Of Grantees Affected By Share Based Compensation Modification Commission Nationale De l'Informatique Et Des Libertés (CNIL) Commission Nationale De l'Informatique Et Des Libertés (CNIL) [Member] Commission Nationale De l'Informatique Et Des Libertés (CNIL) Business Combination [Axis] Business Combination [Axis] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Noncontrolling interests Noncontrolling Interest [Member] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cancelled (in shares) Class Of Warrant Or Right, Canceled During Period Class Of Warrant Or Right, Canceled During Period Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Financial and Other Income and Expenses Other Nonoperating Income and Expense [Text Block] Actuarial gains (losses) on employee benefits, net of taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period 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] Currency translation adjustment Goodwill, Foreign Currency Translation, Gain (Loss) Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] 2026 Financial Liabilities, Due In Next Fiscal Year Financial Liabilities, Due In Next Fiscal Year Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Geographical [Axis] Geographical [Axis] Beginning balance of unrecognized tax benefits Ending balance of unrecognized tax benefits (excluding interest and penalties) Unrecognized Tax Benefits (Excluding Interest And Penalties) Unrecognized Tax Benefits (Excluding Interest And Penalties) Nature of Uncertainty [Axis] Nature of Uncertainty [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Criteo do Brasil Desenvolvimento De Serviços De Internet Ltda. Criteo do Brasil Desenvolvime nto De Serviços De Internet LTDA. [Member] Criteo Do Brasil LTDA [Member] Tax Credits Deferred Tax Assets, Tax Credit Carryforwards Foreign exchange (loss) income Gain (Loss), Foreign Currency Transaction, before Tax Domestic Federal, State, and Local, Income Tax Expense (Benefit), Continuing Operations Asia-Pacific Asia Pacific [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Impairment, intangible asset, statement of Income or Comprehensive Income [extensible enumeration] Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] Title of 12(b) Security Title of 12(b) Security Structured debt securities Structured Debt Securities [Member] Structured Debt Securities Noncurrent financial assets Nontrade Receivables, Noncurrent Criteo Singapore Pte. Ltd. Criteo Singapore Pte. Ltd. [Member] Criteo Singapore Pte. Ltd. [Member] Net income attributable to shareholders per share: Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Financial and other income (expense) Total financial and Other Income (Expense) Financial and other income Nonoperating Income (Expense) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] 2026 Contractual Obligation, to be Paid, Year One Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Iponweb Iponweb [Member] Iponweb Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Impairment Intangible Assets, Accumulated Impairment (Excluding Goodwill) Intangible Assets, Accumulated Impairment (Excluding Goodwill) Expected rate of social charges Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Social Charges Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Social Charges 2030 Financial Liabilities, Due In Fifth Year Financial Liabilities, Due In Fifth Year Total Financial liabilities Financial Liabilities, Fiscal Year Maturity [Abstract] Financial Liabilities, Fiscal Year Maturity [Abstract] Dilutive effect of: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Change in treasury stock (in shares) Change in treasury stock (in shares) Share repurchase program (in shares) Treasury Stock, Shares, Acquired Discounting impact Financial Income And Expense, Discounting Impact Financial Income And Expense, Discounting Impact Award Timing Disclosures [Line Items] Service cost Defined Benefit Plan, Service Cost Other taxes Other taxes receivables, reclassification Prepaid Other Taxes and Other Taxes Receivable Prepaid Other Taxes and Other Taxes Receivable Common shares and Treasury stock Equity [Text Block] Net income attributable to shareholders of Criteo S.A. Net income attributable to shareholders of Criteo S.A. Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Construction in progress Construction in Progress [Member] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Repurchase of treasury stocks Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Voting rights Sale Of Stock, Percent Of Voting Rights Owned After Transaction Sale Of Stock, Percent Of Voting Rights Owned After Transaction Acquired customer relationships Customer Relationships [Member] Income from operations Operating Income (Loss) Line of credit Line of Credit [Member] Employee Benefits Compensation Related Costs, Policy [Policy Text Block] Retained earnings Retained Earnings (Accumulated Deficit) 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] Class of Stock [Axis] Class of Stock [Axis] 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] 2029 Contractual Obligation, to be Paid, Year Four TSR PSUs Total Shareholder Return PSUs [Member] Total Shareholder Return PSUs Other financial income (expense) Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Change in deferred taxes Total Deferred Income Tax Expense (Benefit) Nontaxable or nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Other Foreign Foreign Tax Jurisdiction, Other [Member] 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 Leases Lessor, Leases [Policy Text Block] Criteo BV Criteo BV [Member] Criteo BV [Member] Criteo España S.L. Criteo Espana S.L. [Member] Criteo Espana S.L. [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Treasury shares retired (in shares) Treasury Stock, Shares, Retired Amendment Flag Amendment Flag Tax benefit from equity awards compensation expense Share-Based Payment Arrangement, Expense, Tax Benefit Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Contribution ex-TAC Gross Profit And Other Costs Of Revenue Gross Profit And Other Costs Of Revenue Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Basic (in shares) Weighted average number of shares outstanding (in shares) Weighted average number of shares outstanding of Criteo S.A. (in shares) Weighted Average Number of Shares Outstanding, Basic Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Vested and exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Criteo Do Brasil Criteo Brazil [Member] Criteo Brazil [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] 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 Schedule of Restructuring Reserve by Type of Cost Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common shares par value (in euro per shares) Common Stock, Par or Stated Value Per Share Revision of prior period, reclassification, adjustment Revision of Prior Period, Reclassification, Adjustment [Member] Options granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Use of Estimates Use of Estimates, Policy [Policy Text Block] Criteo Advertising (Beijing) Co. Ltd Criteo Advertising (Beijing) Co. Ltd [Member] Criteo Advertising (Beijing) Co. Ltd [Member] Domestic Deferred Federal, State and Local, Tax Expense (Benefit) Subsequent Events Subsequent Events [Text Block] Foreign currency translation differences, net of taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Performance Media Performance Media [Member] Performance Media Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Increases related to current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Payment for contingent liability on regulatory matters Loss Contingency Accrual, Payments Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Net operating loss carryforwards, not subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration State Administration of Taxation, China State Administration of Taxation, China [Member] Other Deferred Tax Assets, Tax Deferred Expense, Other Issuance of ordinary shares Stock Issued During Period, Value, New Issues Uncertain tax positions Uncertain Tax Liability Uncertain Tax Liability Criteo GmbH Criteo Gmbh [Member] Criteo Gmbh [Member] 2029 Derivative Liability, Due In Fourth Year Derivative Liability, Due In Fourth Year Restructuring incurred cost statement of income or comprehensive income extensible enumeration not disclosed flag Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate Debt Securities [Member]