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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
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]      
Number of Businesses Acquired 6us-gaap_NumberOfBusinessesAcquired    
Business Combination, External Transaction Costs $ 3,713us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed $ 3,160us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed  
Purchase Price Allocation [Abstract]      
Business Combination, Cash and Equivalents   2,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents 2,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Goodwill 447,810us-gaap_Goodwill 220,827us-gaap_Goodwill 206,684us-gaap_Goodwill
Ticket Monster [Member]      
Business Acquisition [Line Items]      
Common stock issued in connection with acquisition of business, shares 13,825,283us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Consideration Transferred [Abstract]      
Business Combinations, cash transferred 96,496us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 162,862us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Consideration Transferred 259,358us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Purchase Price Allocation [Abstract]      
Business Combination, Cash and Equivalents 24,768us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Current Assets, Receivables 17,732us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Current Assets, Deferred Income Taxes 1,264us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Current Assets, Prepaid Expense and Other Assets 829us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Property, Plant, and Equipment 5,944us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Goodwill 218,692us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Other Noncurrent Assets 3,033us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Assets 381,356grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Current Liabilities, Accounts Payable 5,951us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Accrued Merchant and Supplier Payables 82,934grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedMerchantandSupplierPayables
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combinations, Accrued Expenses 22,700grpn_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Current Liabilities, Other 3,482us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Deferred Tax Liabilities Noncurrent 1,264us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Noncurrent Liabilities, Other 5,667us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Liabilities 121,998us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
   
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 259,358us-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 57,022us-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 32,176us-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 571us-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 19,325us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= grpn_TicketMonsterMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
[1]    
Ideeli [Member]      
Consideration Transferred [Abstract]      
Business Combination, Consideration Transferred 42,698us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Purchase Price Allocation [Abstract]      
Business Combination, Cash and Equivalents 79us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Current Assets, Receivables 988us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Current Assets, Deferred Income Taxes 640us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Current Assets, Prepaid Expense and Other Assets 22,081us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Property, Plant, and Equipment 8,173us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Goodwill 4,203us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Deferred Tax Assets Noncurrent 8,877us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Assets 62,131grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Current Liabilities, Accounts Payable 1,640us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Accrued Merchant and Supplier Payables 4,092grpn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedMerchantandSupplierPayables
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combinations, Accrued Expenses 9,118grpn_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Current Liabilities, Other 482us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Deferred Tax Liabilities Noncurrent 348us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Noncurrent Liabilities, Other 3,753us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Liabilities 19,433us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= grpn_IdeeliMember
   
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 42,698us-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 5,490us-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 7,100us-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 4,500us-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 1,429,897us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
   
Number of Businesses Acquired 4us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
7us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
10us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Consideration Transferred [Abstract]      
Business Combinations, cash transferred 17,364us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
9,459us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
49,013us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 11,110us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
3,051us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
 
Business Combination, Consideration Transferred, Liabilities Incurred     2,485us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Business Combination, Contingent Consideration 4,388us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
3,567us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
3,400us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Business Combination, Consideration Transferred 32,862us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
16,077us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
54,898us-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
1,728us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
1,750us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Business Combination, Cash and Equivalents 200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
   
Business Combination, Property, Plant, and Equipment   99us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
165us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Goodwill 27,150us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
9,504us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
39,170us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Business Combination, Deferred Tax Liabilities Noncurrent 398us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
731us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
2,207us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 32,862us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
16,077us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
54,898us-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 2,555us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
[2] 1,928us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
[2] 170us-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   757us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= grpn_MerchantRelationshipsMember
[2] 1,500us-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 3,372us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
[2] 2,742us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
[2] 14,350us-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 579us-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   $ 50us-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.