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Commitments and Contingencies Operating Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 55,000,000us-gaap_LeaseAndRentalExpense $ 42,300,000us-gaap_LeaseAndRentalExpense $ 43,100,000us-gaap_LeaseAndRentalExpense
Amortization period of leasehold improvements 5 years 0 months 0 days    
2015 53,776,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 49,094,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 38,628,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 27,659,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 11,455,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 21,514,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total minimum lease payments $ 202,126,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Rent Escalation 9.00%grpn_RentEscalation
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Lessee Leasing Arrangements, Operating Leases, Term of Contract 7 years 0 months 0 days    
Lessee Leasing Arrangements, Operating Leases, Renewal Term 5 years 0 months 0 days    
Minimum [Member]      
Operating Leased Assets [Line Items]      
Rent Escalation 2.00%grpn_RentEscalation
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Lessee Leasing Arrangements, Operating Leases, Term of Contract 5 years 0 months 0 days    
Lessee Leasing Arrangements, Operating Leases, Renewal Term 1 year 0 months 0 days