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Segment Information Tangible property and equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Tangible property and equipment 103,803,000grpn_Tangiblepropertyandequipment $ 75,639,000grpn_Tangiblepropertyandequipment
North America [Member]    
Segment Reporting Information [Line Items]    
Tangible property and equipment 63,915,000grpn_Tangiblepropertyandequipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember		 [1] 43,126,000grpn_Tangiblepropertyandequipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember		 [1]
EMEA [Member]    
Segment Reporting Information [Line Items]    
Tangible property and equipment 28,721,000grpn_Tangiblepropertyandequipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EMEAMember		 23,413,000grpn_Tangiblepropertyandequipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EMEAMember
ROW [Member]    
Segment Reporting Information [Line Items]    
Tangible property and equipment 11,167,000grpn_Tangiblepropertyandequipment
/ us-gaap_StatementBusinessSegmentsAxis
= grpn_RowMember		 [2] 9,100,000grpn_Tangiblepropertyandequipment
/ us-gaap_StatementBusinessSegmentsAxis
= grpn_RowMember		 [2]
Property, Plant and Equipment [Member]    
Segment Reporting Information [Line Items]    
Concentration of risk, percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember		  
IRELAND    
Segment Reporting Information [Line Items]    
Tangible property and equipment 0.12grpn_Tangiblepropertyandequipment
/ dei_EntityByLocationAxis
= country_IE		  
Switzerland    
Segment Reporting Information [Line Items]    
Tangible property and equipment 0.11grpn_Tangiblepropertyandequipment
/ dei_EntityByLocationAxis
= country_CH		  
[1] Substantially all tangible property and equipment within North America is located in the United States.
[2] Tangible property and equipment, net located within Ireland represented approximately 12% of the Company's consolidated tangible property and equipment, net as of December 31, 2014. Tangible property and equipment, net located within Switzerland represented approximately 11% of the Company's consolidated tangible property and equipment, net as of December 31, 2013. There were no other individual countries located outside of the United States that represented more than 10% of consolidated tangible property and equipment, net as of December 31, 2014 and 2013.