Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets, net
Goodwill and Intangible Assets Disclosure [Text Block]
Debt Disclosure [Abstract]
Debt - credit facility
Debt Disclosure [Text Block]
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
Income Tax Disclosure [Abstract]
Schedule of components of income tax expense/(benefit)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of income (loss) before income tax, domestic and foreign
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Schedule of effective income tax rate reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of deferred tax assets and liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule of valuation and qualifying accounts
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Other Income and Expenses [Abstract]
Foreign exchange rate gains (losses), net
Foreign Exchange Rate Gains (Losses) Due To Revaluation Of Foreign Currency Receivables And Payables
Foreign Exchange Rate Gains (Losses) Due To Revaluation of Foreign Currency Receivables and Payables
Net income from ADS fees
Income (Expense), American Depositary Shares Fees
Income (Expense), American Depositary Shares Fees
Income campus canteen
Income From Campus Canteen
Income From Campus Canteen
Government subsidies
Other Nonoperating Income (Expense), Government Subsidies
Other Nonoperating Income (Expense), Government Subsidies
Rent income
Sublease Income
Other income (expenses)
Other Nonoperating Income (Expense), Other
Other Nonoperating Income (Expense), Other
Total
Other Nonoperating Income (Expense)
Accounting Policies [Abstract]
Basis of presentation
Basis of Accounting, Policy [Policy Text Block]
Consolidation
Consolidation, Policy [Policy Text Block]
Accounting estimates
Use of Estimates, Policy [Policy Text Block]
Revenue recognition
Revenue Recognition, Policy [Policy Text Block]
Cost of revenue
Cost of Sales, Policy [Policy Text Block]
Cash, cash equivalents and restricted cash
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Accounts receivable
Trade and Other Accounts Receivable, Policy [Policy Text Block]
Property and equipment, net including software and website capitalization
Property, Plant and Equipment, Policy [Policy Text Block]
Leases
Lessee, Leases [Policy Text Block]
Business combinations
Business Combinations Policy [Policy Text Block]
Recoverability of goodwill and indefinite-lived intangible assets
Goodwill and Intangible Assets, Policy [Policy Text Block]
Recoverability of intangible assets with definite lives and other long-lived assets
Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]
Income taxes
Income Tax, Policy [Policy Text Block]
Foreign currency translation and transaction gains and losses
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Advertising expense
Advertising Costs, Policy [Policy Text Block]
Share-based compensation
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
Fair value recognition, measurement and disclosure
Fair Value Measurement, Policy [Policy Text Block]
Certain risks and concentration of credit risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Contingent liabilities
Commitments and Contingencies, Policy [Policy Text Block]
Adoption of new accounting pronouncements and Recent accounting policies not yet adopted
New Accounting Pronouncements, Policy [Policy Text Block]
Operating Loss Carryforwards [Table]
Operating Loss Carryforwards [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Trivago N.V.
Trivago N.V. [Member]
Trivago N.V. [Member]
Myhotelshop
Myhotelshop N.V. [Member]
Myhotelshop N.V. [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards [Line Items]
Deferred tax assets:
Deferred Tax Assets, Gross [Abstract]
Net operating loss and tax credit carryforwards
Deferred Tax Assets, Operating Loss Carryforwards And Tax Credit Carryforwards
Deferred Tax Assets, Operating Loss Carryforwards and Tax Credit Carryforwards
Prepaid expense and other current assets
Deferred Tax Assets, Prepaid Expense and Other Current Assets
Deferred Tax Assets, Prepaid Expense and Other Current Assets
Deferred rent
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent
Property and Equipment
Deferred Tax Assets, Property, Plant and Equipment
Accrued expenses and other current liabilities
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals
Intangible assets, net
Deferred Tax Assets, Goodwill and Intangible Assets
Other long-term liabilities
Deferred Tax Assets, Tax Deferred Expense, Other
Other
Deferred Tax Assets, Other
Total deferred tax assets
Deferred Tax Assets, Gross
Less valuation allowance
Deferred Tax Assets, Valuation Allowance
Net deferred tax assets
Deferred Tax Assets, Net of Valuation Allowance
Deferred tax liabilities:
Deferred Tax Liabilities, Gross [Abstract]
Intangible assets, net
Deferred Tax Liabilities, Intangible Assets
Property and equipment
Deferred Tax Liabilities, Property, Plant and Equipment
Accrued expenses and other current liabilities
Deferred Tax Liabilities, Deferred Expense
Other
Deferred Tax Liabilities, Other
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Net deferred tax asset/(liability)
Deferred Tax Liabilities, Net
Net operating loss carryforwards
Operating Loss Carryforwards
Decrease in NOL
Operating Loss Carryforwards, Increase (Decrease)
Operating Loss Carryforwards, Increase (Decrease)
Decrease in tax-effected valuation allowance
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Decrease in tax-effected valuation allowance, related to tax losses from IPO
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Related to Tax Losses from Initial Public Offering
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Related to Tax Losses from Initial Public Offering
Decrease in tax-effected valuation allowance, utilization of previously unrecognized losses
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Utilization of Previously Unrecognized Loss
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Utilization of Previously Unrecognized Loss
Undistributed earnings of foreign subsidiaries (less than)
Undistributed Earnings of Foreign Subsidiaries
Document and Entity Information [Abstract]
Document and Entity Information [Abstract]
Document Information [Table]
Document Information [Table]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Class A Common Stock
Common Class A [Member]
Class B Common Stock
Common Class B [Member]
Document Information [Line Items]
Document Information [Line Items]
Entity Registrant Name
Entity Registrant Name
Trading Symbol
Trading Symbol
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Entity Emerging Growth Company
Entity Emerging Growth Company
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Common Stock, Shares, Outstanding
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Current Reporting Status
Entity Current Reporting Status
Entity Shell Company
Entity Shell Company
Noncontrolling Interest [Abstract]
Redeemable noncontrolling interests
Noncontrolling Interest Disclosure [Text Block]
Subsequent Events [Abstract]
Subsequent Event [Table]
Subsequent Event [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Shares converted (in shares)
Conversion of Stock, Shares Converted
Shares issued upon conversion (in shares)
Conversion of Stock, Shares Issued
Shares issued from options exercised (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount
Charges to Earnings
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense
Deductions
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction
Balance at End of Period
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Expected volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Expected life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Weighted-average estimated fair value of options granted during the year (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Significant accounting policies
Significant Accounting Policies [Text Block]
Property, Plant and Equipment [Abstract]
Schedule of property and equipment, net
Property, Plant and Equipment [Table Text Block]
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Subscribed capital
Subscribed Capital [Member]
Subscribed Capital [Member]
Common Stock
Common Stock [Member]
Reserves
Additional Paid-in Capital [Member]
Retained earnings (accumulated deficit)
Retained Earnings [Member]
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent [Member]
Contribution from Parent
Contribution From Parent [Member]
Contribution from Parent [Member]
Noncontrolling interest
Noncontrolling Interest [Member]
Statement [Line Items]
Statement [Line Items]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Impact of adoption of new accounting guidance
Cumulative Effect of New Accounting Principle in Period of Adoption
Net income (loss), excluding portion attributable to redeemable noncontrolling interest
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest
Other comprehensive income (net of tax)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Settlement of options exercised
Stock Issued During Period, Value, Stock Options Exercised
Adjustment to the fair value of redeemable noncontrolling interests
Noncontrolling Interest, Adjustment To Fair Value Of Redeemable Noncontrolling Interests
Noncontrolling Interest, Adjustment to Fair Value of Redeemable Noncontrolling Interests
Transaction with parent
Shareholders' Equity, Contribution From Parent
Shareholders' Equity, Contribution From Parent
Share-based compensation expense
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Conversion of Class B shares
Conversion of Stock, Amount Converted
Merger of trivago GmbH into and with trivago N.V.
Stock Issued During Period, Value, Acquisitions
Corporate reorganization
Shareholders' Equity, Changes From Corporate Reorganization
Shareholders' Equity, Changes from Corporate Reorganization
Dividends to noncontrolling interest holder
Adjustments to Additional Paid in Capital, Dividends to Noncontrolling Interest Holder
Adjustments to Additional Paid in Capital, Dividends to Noncontrolling Interest Holder
Changes in ownership of noncontrolling interests
Noncontrolling Interest, Changes In Ownership Of Noncontrolling Interests
Noncontrolling Interest, Changes in Ownership of Noncontrolling Interests
Issuance of common stock
Stock Issued During Period, Value, New Issues
Reclassification of option liability to reserves
Shareholders' Equity, Reclassification Of Option Liability To Reserves
Shareholders' Equity, Reclassification of Option Liability to Reserves
Changes in ownership of redeemable noncontrolling interests
Noncontrolling Interest, Changes In Ownership Of Redeemable Noncontrolling Interests
Noncontrolling Interest, Changes In Ownership Of Redeemable Noncontrolling Interests
Ending balance
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Exercised (in share)
Canceled (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period
Ending balance (in shares)
Exercisable (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Vested and expected to vest (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number
Weighted average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance, Weighted average exercise price (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted, Weighted average exercise price (in EUR per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised, Weighted average exercise price (in EUR per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Canceled, Weighted average exercise price (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price
Ending balance, Weighted average exercise price (in EUR per share)
Exercisable, Weighted average exercise price (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Vested and expected to vest, Weighted average exercise price (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price
Outstanding, Remaining contractual term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Exercisable, Remaining contractual term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Vested and expected to vest after, Remaining contractual life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term
Outstanding, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Granted, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted, Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted, Aggregate Intrinsic Value
Exercised, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Canceled, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Canceled, Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Canceled, Aggregate Intrinsic Value
Outstanding, Aggregate intrinsic value
Exercisable, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Vested and expected to vest, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value
Reconciliation of redeemable noncontrolling interest
Redeemable Noncontrolling Interest [Table Text Block]
Business Combinations [Abstract]
Acquisitions and divestitures
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies
Commitments and Contingencies Disclosure [Text Block]
Other, net
Other Nonoperating Income and Expense [Text Block]
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid advertising
Prepaid Advertising
Other prepaid expenses
Other Prepaid Expense, Current
Other assets
Other Assets, Current
Total
Prepaid Expense and Other Assets, Current
Earnings Per Share [Abstract]
Earnings per share
Earnings Per Share [Text Block]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
Düsseldorf, Germany
Düsseldorf, Germany [Member]
Düsseldorf, Germany [Member]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Building and leasehold improvements
Building And Leasehold Improvements [Member]
Building And Leasehold Improvements [Member]
Capitalized software and software development costs
Software and Software Development Costs [Member]
Computer equipment
Computer Equipment [Member]
Furniture and fixtures
Furniture and Fixtures [Member]
Office equipment
Office Equipment [Member]
Construction in process
Construction in Progress [Member]
Building and leasehold improvements with asset retirement obligations
Building And Leasehold Improvements With Asset Retirement Obligations [Member]
Building And Leasehold Improvements With Asset Retirement Obligations [Member]
Software Development Costs
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Property and equipment, gross
Property, Plant and Equipment, Gross
Less: accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property and equipment, net
Property, Plant and Equipment, Net
Impairment charges
Impairment of Long-Lived Assets to be Disposed of
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
United States
UNITED STATES
United Kingdom
UNITED KINGDOM
Germany
GERMANY
Australia
AUSTRALIA
Spain
SPAIN
All other countries
All Other Countries [Member]
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues
Revenues
Long-term purchase commitment
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
Schedule of estimated future minimum rental payments under operating leases
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Principal owner
Principal Owner [Member]
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Data Hosting Services Agreement
Data Hosting Services Agreement [Member]
Data Hosting Services Agreement [Member]
Services and Support Agreement
Services and Support Agreement [Member]
Services and Support Agreement [Member]
Counterparty Name [Axis]
Counterparty Name [Axis]
Counterparty Name [Domain]
Counterparty Name [Domain]
Expedia
Expedia Inc. [Member]
Expedia Inc.[Member]
Lender Name [Axis]
Lender Name [Axis]
Line of Credit Facility, Lender [Domain]
Line of Credit Facility, Lender [Domain]
Bank of America Merrill Lynch International Ltd.
Bank of America Merrill Lynch International Ltd. [Member]
Bank of America Merrill Lynch International Ltd. [Member]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Uncommitted Credit Facility
Line of Credit [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
LIBOR
London Interbank Offered Rate (LIBOR) [Member]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Revenue
Sales Revenue, Net [Member]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Customer Concentration Risk
Customer Concentration Risk [Member]
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Prior notice period on customary commercial terms
Related Party Transaction, Prior Notice Period on Customary Commercial Terms
Related Party Transaction, Prior Notice Period on Customary Commercial Terms
Revenue from related party
Revenue from Related Parties
Concentration risk, percentage
Concentration Risk, Percentage
Other operating expenses from related party
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party
Accounts receivable, related party
Accounts Receivable, Related Parties, Current
Uncommitted credit facility principle amount
Line of Credit Facility, Maximum Borrowing Capacity
Debt basis spread on variable rate
Debt Instrument, Basis Spread on Variable Rate
Proceeds from issuance of credit facility
Proceeds from Lines of Credit
Repayments of debt
Repayments of Lines of Credit
Proceeds from issuance of loan from related party
Proceeds from Related Party Debt
Termination notice period
Related Party Transaction, Termination Notice Period
Related Party Transaction, Termination Notice Period
Expenses to related party
Related Party Transaction, Expenses from Transactions with Related Party
Schedule of basic and diluted earnings per share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Statement of Cash Flows [Abstract]
Operating activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Adjustments to reconcile net loss to net cash provided by/(used in):
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation (property and equipment, internal-use software and website development)
Depreciation
Amortization of intangible assets
Amortization of Intangible Assets
Impairment of internal-use software and website development
Impairment of Intangible Assets, Finite-lived
Share-based compensation (See Note 10)
Share-based Compensation
Deferred income taxes
Deferred Income Taxes and Tax Credits
Foreign exchange (gain) loss
Foreign Currency Transaction Gain (Loss), before Tax
Bad debt expense
Provision for Doubtful Accounts
Non-cash charge, contribution from Parent
Non-cash Charge, Contribution From Parent
Non-cash Charge, Contribution From Parent
Gain on deconsolidation of entity
Deconsolidation, Gain (Loss), Amount
Loss on sale of fixed assets
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Gain from equity method investment
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions
Changes in operating assets and liabilities:
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]
Accounts receivable, including related party
Increase (Decrease) in Receivables
Prepaid expense and other assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accounts payable
Increase (Decrease) in Accounts Payable
Payroll liabilities
Increase (Decrease) in Employee Related Liabilities
Accrued expenses and other liabilities
Increase (Decrease) in Accrued Liabilities
Deferred revenue
Increase (Decrease) in Deferred Revenue
Taxes payable/receivable, net
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable
Net cash provided by/(used in) operating activities
Net Cash Provided by (Used in) Operating Activities
Investing activities:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Acquisition of business, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Acquisition of redeemable noncontrolling interests
Payments to Acquire Interest in Subsidiaries and Affiliates
Cash divested from deconsolidation
Cash Divested from Deconsolidation
Capital expenditures, including internal-use software and website development
Payments for Capital Improvements
Proceeds from sale of fixed assets
Proceeds from Sale of Property, Plant, and Equipment
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Financing activities:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments of initial public offering costs
Payments of Stock Issuance Costs
Dividends paid to noncontrolling interest
Payments to Noncontrolling Interests
Payments on credit facility
Net proceeds from issuance of common stock
Proceeds from Issuance of Common Stock
Tax payments for shares withheld
Payments Related to Tax Withholding for Share-based Compensation
Net cash provided by/(used in) financing activities
Net Cash Provided by (Used in) Financing Activities
Effect of exchange rate changes on cash, cash equivalents and restricted cash
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Net increase/(decrease) in cash, cash equivalents and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Cash, cash equivalents and restricted cash at beginning of year
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash, cash equivalents and restricted cash at end of year
Supplemental cash flow information:
Supplemental Cash Flow Information [Abstract]
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
Cash paid for taxes, net of refunds
Income Taxes Paid
Non-cash investing and financing activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Offering costs included in accrued expenses
Offering Costs Included in Accrued Expenses
Offering Costs Included in Accrued Expenses
Fixed assets-related payable
Capital Expenditures Incurred but Not yet Paid
Capitalization of construction in process related to build-to-suit lease
Construction in Progress Expenditures Incurred but Not yet Paid
Extinguishment of loan to members through contribution from Parent in members’ equity
Extinguishment Of Loan To Members Through Contribution From Parent In Members’ Equity
Extinguishment Of Loan To Members Through Contribution From Parent In Members’ Equity
Extinguishment of loan from related party through members’ liability
Extinguishment Of Loan From Related Party Through Members’ Liability
Extinguishment Of Loan From Related Party Through Members’ Liability
Schedule of goodwill and intangible assets
Schedule of Intangible Assets and Goodwill [Table Text Block]
Schedule of goodwill
Schedule of Goodwill [Table Text Block]
Components of intangible assets with definite lives
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Schedule of definite lives intangible assets, future amortization expense
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Income taxes
Income Tax Disclosure [Text Block]
Equity [Abstract]
Stockholders'/members' equity
Stockholders' Equity Note Disclosure [Text Block]
Issuance costs
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs
Net loss attributable to redeemable noncontrolling interest
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest
Income Statement [Abstract]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Acquired technology
Acquired Technology [Member]
Acquired Technology [Member]
Internal use software and website development costs
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Cost of revenue
Cost of Sales [Member]
Selling and marketing
Selling and Marketing Expense [Member]
Technology and content, net of capitalized internal-use software and website development costs
Research and Development Expense [Member]
General and administrative
General and Administrative Expense [Member]
Share-based compensation
Allocated Share-based Compensation Expense
Amortization of intangible assets
General and administrative expenses from related party
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Rheinfabrik, Myhotelshop NV, And Base7booking Acquisitions
Rheinfabrik, Myhotelshop NV, And Base7booking Acquisitions [Member]
Rheinfabrik, Myhotelshop NV, And Base7booking Acquisitions [Member]
Base7 and Myhotelshop
Base7 and Myhotelshop [Member]
Base7 and Myhotelshop [Member]
Myhotelshop N.V.
Base7booking.com
Base7booking.com [Member]
Base7booking.com [Member]
tripl GmbH
tripl GmbH [Member]
tripl GmbH [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Percentage of equity interest acquired
Business Acquisition, Percentage of Voting Interests Acquired
Cash purchase consideration
Business Combination, Consideration Transferred
Total purchase consideration
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest
Goodwill
Goodwill
Redeemable noncontrolling interest
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value
Acquisition-related costs
Business Combination, Acquisition Related Costs
Number of operating segments
Number of Operating Segments
Revenue of acquiree
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual
Operating losses of acquiree
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Information [Abstract]
Revenue
Business Acquisition, Pro Forma Revenue
Net loss
Business Acquisition, Pro Forma Net Income (Loss)
Payments to acquire businesses
Payments to Acquire Businesses, Gross
Number of reportable segments
Number of Reportable Segments
Numerator:
Earnings Per Share Reconciliation [Abstract]
Net income/(loss)
Net loss attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Net loss attributable to trivago N.V.
Net Income (Loss) Attributable to Parent
Denominator:
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average shares of Class A and Class B common stock outstanding - basic and diluted (shares)
Weighted Average Number of Shares Outstanding, Basic and Diluted
Earnings per share attributable to trivago N.V. available to Class A and Class B common stockholders - basic and diluted (in EUR per share)
Earnings Per Share, Basic and Diluted
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Total other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive loss
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Less: Comprehensive loss attributable to noncontrolling interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Comprehensive loss attributable to trivago N.V.
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Segment information
Segment Reporting Disclosure [Text Block]
Schedule of other, net
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Uncertain tax positions
Unrecognized Tax Benefits
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase Obligation, Fiscal Year Maturity [Abstract]
Total
Purchase Obligation
Less than 1 year
Purchase Obligation, Due in Next Twelve Months
1 to 3 years
Purchase Obligation, Due in Second and Third Year
3 to 5 years
Purchase Obligation, Due in Fourth and Fifth Year
More than 5 years
Purchase Obligation, Due after Fifth Year
Rental expense
Operating Leases, Rent Expense, Net
Asset retirement obligation
Asset Retirement Obligation
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2020
Operating Leases, Future Minimum Payments, Due in Two Years
2021
Operating Leases, Future Minimum Payments, Due in Three Years
2022
Operating Leases, Future Minimum Payments, Due in Four Years
2023
Operating Leases, Future Minimum Payments, Due in Five Years
2024 and thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Total
Operating Leases, Future Minimum Payments Due
Minimum sublease rentals receivable
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
Trivago amended option plan
Trivago Amended Option Plan [Member]
Trivago Amended Option Plan [Member]
2016 Omnibus Incentive Plan
2016 Omnibus Incentive Plan [Member]
2016 Omnibus Incentive Plan [Member]
Award Type [Axis]
Award Type [Axis]
Equity Award [Domain]
Equity Award [Domain]
Stock Option
Employee Stock Option [Member]
Share Appreciation Rights
Stock Appreciation Rights (SARs) [Member]
Strike price for majority of options (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Strike Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Strike Price
Award vesting period (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Number of options outstanding (in shares)
Number of replacement awards at acquisition (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Replacement Awards at Acquisition
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Replacement Awards at Acquisition
Common stock, conversion ratio
Common Stock, Economic And Voting Rights, Conversion Ratio
Common Stock, Economic And Voting Rights, Conversion Ratio
Related party payable
Due to Related Parties, Current
One-time modification charge due to classification of awards from equity to liability accounting treatment
Share-Based Compensation Arrangement By Share-based Payment Award, One-time Modification Charge Due To Classification Of Awards From Equity To Liability Accounting Treatment
Share-based Compensation Arrangement By Share-based Payment Award, One-time Modification Charge Due To Classification Of Awards From Equity To Liability Accounting Treatment
Contribution from Parent
Stockholders' Equity, Equity Contributed by Parent
Stockholders' Equity, Equity Contributed by Parent
Loans receivable from shareholders
Loans and Leases Receivable, Related Parties
Ownership percentage by parent
Noncontrolling Interest, Ownership Percentage by Parent
Proceeds from exercise of option awards
Proceeds from Stock Options Exercised
Number of shares available for grant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Number of supervisory board in plan administration committee
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Supervisory Board In Plan Administration Committee
Share-based Compensation Arrangement by Share-based Payment Award, Number of Supervisory Board in Plan Administration Committee
Share-based payment award, term
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
Number of shares awarded (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Awarded
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Awarded
Intrinsic value of shares exercised
Number of options subject to liability accounting (in shares)
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Number Of Awards Subject To Liability Accounting
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Awards Subject to Liability Accounting
Income tax benefit related to share-based compensation expense
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Capitalized share-based compensation cost
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount
Unrecognized share-based compensation expense
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized
Unrecognized share-based compensation expense, period for recognition
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Valuation and qualifying accounts
Valuation And Qualifying Accounts Disclosure [Text Block]
Valuation And Qualifying Accounts Disclosure [Text Block]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Customer relationships
Customer Relationships [Member]
Partner relationships
Partner Relationships [Member]
Partner Relationships [Member]
Technology
Technology-Based Intangible Assets [Member]
Non-compete agreement
Noncompete Agreements [Member]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Developed Europe
Developed Europe Segment [Member]
Developed Europe Segment [Member]
Americas
Americas Segment [Member]
Americas Segment [Member]
Rest of World
Rest Of World Segment [Member]
Rest of World Segment [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with definite lives, net
Finite-Lived Intangible Assets, Net
Intangible assets with indefinite lives
Indefinite-lived Intangible Assets (Excluding Goodwill)
Total
Intangible Assets, Net (Including Goodwill)
Accumulated impairment losses of goodwill
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated impairment losses of indefinite-lived intangible assets
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Goodwill, Beginning Balance
Foreign exchange translation
Goodwill, Foreign Currency Translation Gain (Loss)
Acquisition of Tripl
Goodwill, Acquired During Period
Deconsolidation of myhotelshop
Goodwill, Written off Related to Sale of Business Unit
Goodwill, Ending Balance
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Net [Abstract]
Cost
Finite-Lived Intangible Assets, Gross
(Accumulated Amortization)
Finite-Lived Intangible Assets, Accumulated Amortization
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
2020
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2021
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2022
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Future years
Finite-Lived Intangible Assets, Amortization Expense, Year Four
Fair Value Disclosures [Abstract]
Fair value measurement
Fair Value Disclosures [Text Block]
RSUs
Restricted Stock Units (RSUs) [Member]
RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Cancelled (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted (in EUR 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
Vested (in EUR 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
Cancelled (in EUR per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Ending balance (in EUR per share)
Granted, remaining contractual life
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Weighted Average Remaining Contractual Terms
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Weighted Average Remaining Contractual Terms
Ending balance, remaining contractual life
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms
Statement of Financial Position [Abstract]
Accounts receivable, allowance
Allowance for Doubtful Accounts Receivable, Current
Class common stock, par value
Common Stock, Par or Stated Value Per Share
Class common stock, shared authorized
Common Stock, Shares Authorized
Class common stock, shares issued
Common Stock, Shares, Issued
Subsequent events
Subsequent Events [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]
Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]
Travel B.V.
Travel B.V. [Member]
Travel B.V. [Member]
Trivago GmbH
Trivago GmbH [Member]
Trivago GmbH [Member]
Messrs. Schrömgens, Vinnemeier and Siewert
Messrs. Schrömgens, Vinnemeier and Siewert [Member]
Messrs. Schrömgens, Vinnemeier and Siewert [Member]
Sale of Stock [Axis]
Sale of Stock [Axis]
Sale of Stock [Domain]
Sale of Stock [Domain]
IPO
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Number of common stock per ADS
Number of Common Stock Per American Depositary Share
Number of Common Stock per American Depositary Share
Class common stock, par value (in EUR per ADS)
Public offering price (in USD per ADS)
Sale of Stock, Price Per Share
Net offering proceeds from issuance initial public offering
Sale of Stock, Consideration Received on Transaction
Ownership percentage by noncontrolling owners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Number of shares contributed by the Founders (in shares)
Number of Shares Contributed by Noncontrolling Owners
Number of Shares Contributed by Noncontrolling Owners
Number of shares contributed by the Founders, percentage
Number of Shares Contributed by Noncontrolling Owners, Percentage
Number of Shares Contributed by Noncontrolling Owners, Percentage
Voting ownership by shareholders
Voting Ownership by Shareholders, Percent
Voting Ownership by Shareholders, Percent
Ownership by shareholders
Ownership by Shareholders, Percent
Ownership by Shareholders, Percent
Voting power percentage by parent
Noncontrolling Interest, Voting Power Percentage by Parent
Noncontrolling Interest, Voting Power Percentage by Parent
Voting power percentage by noncontrolling owners
Noncontrolling Interest, Voting Power Percentage by Noncontrolling Owners
Noncontrolling Interest, Voting Power Percentage by Noncontrolling Owners
Indirect ownership percentage by Parent
Indirect Ownership Percentage by Parent
Indirect Ownership Percentage by Parent
Indirect voting power percentage by Parent
Indirect Voting Power Percentage by Parent
Indirect Voting Power Percentage by Parent
ASSETS
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Cash
Restricted cash
Restricted Cash and Cash Equivalents, Current
Accounts receivable, less allowance of €231 and €250 at December 31, 2017 and December 31, 2018, respectively
Accounts Receivable, Net, Current
Tax receivable
Income Taxes Receivable, Current
Prepaid expenses and other current assets
Total Current Assets
Assets, Current
Other long-term assets
Other Assets, Noncurrent
Intangible assets, net
Intangible Assets, Net (Excluding Goodwill)
TOTAL ASSETS
Assets
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Income taxes payable
Accrued Income Taxes, Current
Deferred revenue
Contract with Customer, Liability, Current
Payroll liabilities
Employee-related Liabilities, Current
Accrued expenses and other current liabilities
Accrued Liabilities, Current
Total Current Liabilities
Liabilities, Current
Financing obligations
Capital Lease Obligations, Noncurrent
Deferred income taxes
Deferred Tax Liabilities, Net, Noncurrent
Other long-term liabilities
Other Liabilities, Noncurrent
Commitments and contingencies (Note 16)
Commitments and Contingencies
Redeemable noncontrolling interests
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Stockholders' equity:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common stock
Common Stock, Value, Issued
Reserves
Additional Paid in Capital
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Total stockholders' equity attributable to trivago N.V.
Stockholders' Equity Attributable to Parent
Noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest
Total stockholders' equity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities and Equity
Property and equipment, net
Property, Plant and Equipment Disclosure [Text Block]
Schedule of stock options activity
Share-based Compensation, Stock Options, Activity [Table Text Block]
Schedule of stock options valuation assumptions
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of RSU activity
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Scenario, Forecast
Scenario, Forecast [Member]
Adjustments for New Accounting Pronouncements [Axis]
Adjustments for New Accounting Pronouncements [Axis]
Type of Adoption [Domain]
Type of Adoption [Domain]
ASU 2016-02
Accounting Standards Update 2016-02 [Member]
Priceline.com
Priceline.com [Member]
Priceline.com [Member]
Accounts Receivable
Accounts Receivable [Member]
Computer equipment, capitalized software and software development cost and furniture and other equipment
Computer Equipment, Capitalized Software and Software Development Costs, Furniture And Other Equipment [Member]
Computer Equipment, Capitalized Software and Software Development Costs, Furniture And Other Equipment [Member]
Buildings
Building [Member]
Software Enhancement Costs
Software Enhancement Costs [Member]
Software Enhancement Costs [Member]
Significant Accounting Policies [Line Items]
Significant Accounting Policies [Line Items]
[Line Items] for Significant Accounting Policies [Table]
Revenue recognized that was included in beginning deferred revenue balance
Contract with Customer, Liability, Revenue Recognized
Restricted cash
Restricted Cash and Cash Equivalents
Restricted cash, noncurrent
Restricted Cash and Cash Equivalents, Noncurrent
Property and equipment useful life
Property, Plant and Equipment, Useful Life
Land rent expense
Land Rent Expense
Land Rent Expense
Number of reporting units
Number of Reporting Units
Intangible asset, useful life
Finite-Lived Intangible Asset, Useful Life
Advertising spend
Advertising Expense
Right-of use asset
Operating Lease, Right-of-Use Asset
Right-of use asset, gross
Operating Lease, Right-of-Use Asset, Gross
Operating Lease, Right-of-Use Asset, Gross
Right-of use asset, lease incentives and deferred rent
Operating Lease, Right-of-Use Asset, Lease Incentive
Operating Lease, Right-of-Use Asset, Lease Incentive
Operating lease liability
Operating Lease, Liability
Depreciation
Noncontrolling Interest [Table]
Noncontrolling Interest [Table]
Investment, Name [Axis]
Investment, Name [Axis]
Investment, Name [Domain]
Investment, Name [Domain]
Noncontrolling Interest [Line Items]
Noncontrolling Interest [Line Items]
Proceeds from issuance of new shares
Percentage ownership before transaction
Sale of Stock, Percentage of Ownership before Transaction
Percentage ownership after transaction
Sale of Stock, Percentage of Ownership after Transaction
Gain from divestiture
Gain on retained noncontrolling investment
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount
Gain recognized on receivable from loan granted to investment
Gain (Loss) on Sale of Accounts Receivable
Share-based awards and other equity instruments
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Organization and basis of presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Current income tax expense (benefit):
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Germany
Current Federal Tax Expense (Benefit)
Other countries
Current Foreign Tax Expense (Benefit)
Current income tax expense (benefit)
Current Income Tax Expense (Benefit)
Deferred income tax (benefit) expense:
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Germany
Deferred Federal Income Tax Expense (Benefit)
Other countries
Deferred Foreign Income Tax Expense (Benefit)
Deferred income tax (benefit) expense
Deferred Income Tax Expense (Benefit)
Income tax expense (benefit)
Income Tax Expense (Benefit)
Retirement Benefits [Abstract]
Employee benefit plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Related party transactions
Related Party Transactions Disclosure [Text Block]
Prepaid expenses and other current assets
Other Current Assets [Text Block]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Referral revenue
Referral [Member]
Referral [Member]
Subscription revenue
Subscription and Circulation [Member]
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Operating Segments
Operating Segments [Member]
Corporate & Eliminations
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Revenue
Other revenue
Other Income
ROAS contribution
Return On Advertising Spend Contribution
Return On Advertising Spend Contribution
Costs and expenses:
Costs and Expenses [Abstract]
Cost of revenue, including related party, excluding amortization
Cost of Revenue
Other selling and marketing
Other Selling and Marketing Expense
Technology and content
Technology and Content Expense
Technology and Content Expense
General and administrative, including related party
General and Administrative Expense
Operating loss
Operating Income (Loss)
Other income/(expense)
Nonoperating Income (Expense) [Abstract]
Interest expense
Interest Expense
Gain on deconsolidation of entity
Other, net
Total other income/(expense), net
Nonoperating Income (Expense)
Loss before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Provision for income taxes
Net loss before equity method investment
Income (Loss) from Continuing Operations before Equity Method Investments And Noncontrolling Interest
Income (Loss) from Continuing Operations before Equity Method Investments And Noncontrolling Interest
Income from equity method investment
Income (Loss) from Equity Method Investments
Net loss
Revenue
Revenue from Contract with Customer, Including Assessed Tax
Total revenue
Selling and marketing
Selling and Marketing Expense
Expense/(benefit) for income taxes
Earnings per share attributable to trivago N.V. available to common stockholders:
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted (in EUR per share)
Shares used in computing earnings per share:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Prepaid expenses and other current assets
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
Germany
Income (Loss) from Continuing Operations before Income Taxes, Domestic
Other countries
Income (Loss) from Continuing Operations before Income Taxes, Foreign
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at German tax rate (31.23%)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Foreign rate differential
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount
Expected tax expense (benefit)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Expected Tax Expense (Benefit)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Expected Tax Expense (Benefit)
Tax effect from:
Effective Income Tax Rate Reconciliation, Reconciling Items, Amount [Abstract]
Effective Income Tax Rate Reconciliation, Reconciling Items, Amount [Abstract]
Non-deductible share-based compensation
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount
Non-deductible corporate costs
Effective Income Tax Rate Reconciliation, Non-deductible Expenses, Corporate Costs, Amount
Effective Income Tax Rate Reconciliation, Non-deductible Expenses, Corporate Costs, Amount
Movement in valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Foreign withholding taxes
Effective Income Tax Rate Reconciliation, Foreign Withholding Tax, Amount
Effective Income Tax Rate Reconciliation, Foreign Withholding Tax, Amount
Other differences
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount
German tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent
Non-tax deductible expense, release of contingent asset
Non-tax Deductible Expense, Release of Contingent Asset
Non-tax Deductible Expense, Release of Contingent Asset
Total non-tax deductible expense
Non-tax Deductible Expense
Non-tax Deductible Expense
Corporate costs pushed down from Parent
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of the period
Net loss attributable to noncontrolling interests
Fair value adjustments through members’ equity
Currency translation adjustments and other
Noncontrolling Interest, Currency Translation Adjustments And Other
Noncontrolling Interest, Currency Translation Adjustments and Other
Change in ownership of noncontrolling interest
Redeemable Noncontrolling Interest, Changes In Ownership Of Noncontrolling Interests
Redeemable Noncontrolling Interest, Changes In Ownership Of Noncontrolling Interests
Deconsolidation of entity
Noncontrolling Interest, Decrease from Deconsolidation
Balance, end of period
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Class of Stock [Line Items]
Class of Stock [Line Items]
Exchangeable shares, outstanding
Shares Exchangeable, Outstanding
Shares Exchangeable, Outstanding
Common stock, voting rights per share
Common Stock, Voting Rights, Per Share
Common Stock, Voting Rights, Per Share
Common stock dividends
Subscribed Capital Dividends
Subscribed Capital Dividends
Payments of common stock dividends
Payments of Dividends on Subscribed Capital
Payments of Dividends on Subscribed Capital