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Compensation Arrangements Compensation Arrangement Stock Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred Stock, Shares Authorized 50,000,000us-gaap_PreferredStockSharesAuthorized    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 44,043,631us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Stock-based compensation $ 122,019us-gaap_ShareBasedCompensation $ 121,462us-gaap_ShareBasedCompensation $ 104,117us-gaap_ShareBasedCompensation
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 11,244us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 9,100us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 9,700us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 221,700us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 3 months 18 days    
Employee Stock Purchase Plan, shares authorized 10,000,000grpn_EmployeeStockPurchasePlanSharesAuthorized    
Employee Stock Purchase Plan, issued shares 857,171grpn_EmployeeStockPurchasePlanissuedshares 774,288grpn_EmployeeStockPurchasePlanissuedshares  
2008 Plan [Domain]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Stock, Shares Authorized 64,618,500us-gaap_CommonStockSharesAuthorized
/ us-gaap_PlanNameAxis
= grpn_A2008PlanDomain
   
2010 Plan [Domain]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Stock, Shares Authorized 20,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_PlanNameAxis
= grpn_A2010PlanDomain
   
2011 Plan [Domain]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Stock, Shares Authorized 50,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_PlanNameAxis
= grpn_A2011PlanDomain