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Business Combinations and Acquisitions of Noncontrolling Interests Business Combinations (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Businesses Acquired | 6 us-gaap_NumberOfBusinessesAcquired |  |  |  |  |
Business Combination, External Transaction Costs | $ 3,713 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed |  | $ 3,160 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Cash and Equivalents |  |  | 2,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents |  | 2,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents |
Goodwill | 447,810 us-gaap_Goodwill |  | 220,827 us-gaap_Goodwill |  | 206,684 us-gaap_Goodwill |
Ticket Monster [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock issued in connection with acquisition of business, shares | 13,825,283 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Consideration Transferred [Abstract] |  |  |  |  |  |
Business Combinations, cash transferred | 96,496 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 162,862 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Consideration Transferred | 259,358 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Cash and Equivalents | 24,768 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Current Assets, Receivables | 17,732 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Current Assets, Deferred Income Taxes | 1,264 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Current Assets, Prepaid Expense and Other Assets | 829 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Property, Plant, and Equipment | 5,944 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Goodwill | 218,692 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Other Noncurrent Assets | 3,033 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Assets | 381,356 grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Current Liabilities, Accounts Payable | 5,951 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Accrued Merchant and Supplier Payables | 82,934 grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedMerchantandSupplierPayables / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combinations, Accrued Expenses | 22,700 grpn_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedExpenses / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Current Liabilities, Other | 3,482 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Deferred Tax Liabilities Noncurrent | 1,264 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Noncurrent Liabilities, Other | 5,667 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Liabilities | 121,998 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 259,358 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember |  |  |  |  |
Ticket Monster [Member] | Subscriber Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 57,022 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | [1] |  |  |  |
Ticket Monster [Member] | Merchant Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 32,176 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grpn_MerchantRelationshipsMember | [1] |  |  |  |
Ticket Monster [Member] | Developed Technology [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 571 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | [1] |  |  |  |
Ticket Monster [Member] | Trade names [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 19,325 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_TicketMonsterMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [1] |  |  |  |
Ideeli [Member] |  |  |  |  |  |
Consideration Transferred [Abstract] |  |  |  |  |  |
Business Combination, Consideration Transferred | 42,698 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Cash and Equivalents | 79 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Current Assets, Receivables | 988 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Current Assets, Deferred Income Taxes | 640 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Current Assets, Prepaid Expense and Other Assets | 22,081 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Property, Plant, and Equipment | 8,173 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Goodwill | 4,203 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Deferred Tax Assets Noncurrent | 8,877 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Assets | 62,131 grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Current Liabilities, Accounts Payable | 1,640 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Accrued Merchant and Supplier Payables | 4,092 grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedMerchantandSupplierPayables / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combinations, Accrued Expenses | 9,118 grpn_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedExpenses / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Current Liabilities, Other | 482 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Deferred Tax Liabilities Noncurrent | 348 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Noncurrent Liabilities, Other | 3,753 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Liabilities | 19,433 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 42,698 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember |  |  |  |  |
Ideeli [Member] | Subscriber Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 5,490 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | [1] |  |  |  |
Ideeli [Member] | Brand Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 7,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grpn_BrandRelationshipsMember | [1] |  |  |  |
Ideeli [Member] | Trade names [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 0 months 0 days |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 4,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = grpn_IdeeliMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [1] |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock issued in connection with acquisition of business, shares | 1,429,897 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |
Number of Businesses Acquired | 4 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 7 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 10 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Consideration Transferred [Abstract] |  |  |  |  |  |
Business Combinations, cash transferred | 17,364 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 9,459 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 49,013 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 11,110 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 3,051 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  | 2,485 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Business Combination, Contingent Consideration | 4,388 us-gaap_BusinessCombinationConsiderationTransferredOther1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 3,567 us-gaap_BusinessCombinationConsiderationTransferredOther1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 3,400 us-gaap_BusinessCombinationConsiderationTransferredOther1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Business Combination, Consideration Transferred | 32,862 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 16,077 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 54,898 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | (396)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 1,728 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 1,750 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Business Combination, Cash and Equivalents | 200 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |
Business Combination, Property, Plant, and Equipment |  |  | 99 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 165 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Goodwill | 27,150 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 9,504 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 39,170 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Business Combination, Deferred Tax Liabilities Noncurrent | 398 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 731 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 2,207 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 32,862 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 16,077 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  | 54,898 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Series of Individually Immaterial Business Acquisitions [Member] | Subscriber Relationships [Member] |  |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 2,555 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | [2] | 1,928 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | [2] | 170 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | [2]
Series of Individually Immaterial Business Acquisitions [Member] | Merchant Relationships [Member] |  |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets |  |  | 757 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grpn_MerchantRelationshipsMember | [2] | 1,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grpn_MerchantRelationshipsMember | [2]
Series of Individually Immaterial Business Acquisitions [Member] | Developed Technology [Member] |  |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 3,372 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | [2] | 2,742 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | [2] | 14,350 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | [2]
Series of Individually Immaterial Business Acquisitions [Member] | Brand Relationships [Member] |  |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets | 579 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = grpn_BrandRelationshipsMember | [2] |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] | Other Intangible Assets [Member] |  |  |  |  |  |
Purchase Price Allocation [Abstract] |  |  |  |  |  |
Business Combination, Intangible assets |  |  | $ 50 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | [2] |  |
Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 0 months 0 days |  |  |  |  |
Maximum [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 0 months 0 days |  | 5 years 0 months 0 days |  | 5 years 0 months 0 days |
Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year 0 months 0 days |  |  |  |  |
Minimum [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year 0 months 0 days |  | 1 year 0 months 0 days |  | 1 year 0 months 0 days |
[1] | The estimated useful lives of the acquired intangible assets are 5 years for subscriber relationships, 3 years for merchant relationships, 2 years for developed technology and 5 years for trade name.
[2] | Acquired intangible assets have estimated useful lives of between 1 and 5 years.

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Merchant and Supplier Payables + References No definition available. + Details
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Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets, Including Goodwill + References No definition available. + Details
Name: | grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses + References No definition available. + Details
Name: | grpn_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedExpenses
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