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Fair Value Measurements Fair Value Measurements Measured at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cost method investments $ 15,630us-gaap_CostMethodInvestments $ 15,788us-gaap_CostMethodInvestments   $ 128,100us-gaap_CostMethodInvestments
Equity method investments 1,231us-gaap_EquityMethodInvestments 1,690us-gaap_EquityMethodInvestments 495us-gaap_EquityMethodInvestments  
Cost Method Investments, Fair Value Disclosure 16,134us-gaap_CostMethodInvestmentsFairValueDisclosure 15,573us-gaap_CostMethodInvestmentsFairValueDisclosure    
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity method investments     495us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
F-Tuan [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cost method investments     34,982us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grpn_FTuanMember
 
F-Tuan [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cost method investments     $ 34,982us-gaap_CostMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grpn_FTuanMember