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Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 47,122us-gaap_AmortizationOfIntangibleAssets $ 21,626us-gaap_AmortizationOfIntangibleAssets $ 19,910us-gaap_AmortizationOfIntangibleAssets
Finite-Lived Intangible Assets, Net, Amortization Expense [Abstract]      
2015 40,495us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2016 33,707us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 18,653us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 17,617us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 85us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Total - Finite Lived Intangible Asset, Amortization Expense $ 110,557grpn_FiniteLivedIntangibleAssetsAmortizationExpenseTotal    
Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 0 months 0 days    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years 0 months 0 days