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Segment Information Total Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Assets	2,227,597us-gaap_Assets		$ 2,042,010us-gaap_Assets
UNITED STATES
Segment Reporting Information [Line Items]
Total Assets	1,120,400us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_US		1,231,300us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_US
North America [Member]
Segment Reporting Information [Line Items]
Total Assets	1,150,417us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember	[1]	1,267,158us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember	[1]
EMEA [Member]
Segment Reporting Information [Line Items]
Total Assets	552,486us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember		616,126us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember
ROW [Member]
Segment Reporting Information [Line Items]
Total Assets	524,694us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember	[1]	158,726us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember	[1]
Korea [Member]
Segment Reporting Information [Line Items]
Total Assets	388,000us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_KR
Assets, Total [Member]
Segment Reporting Information [Line Items]
Concentration of risk, percentage	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember
[1] (1)North America contains assets from the United States of $1,120.4 million and $1,231.3 million as of December 31, 2014 and 2013, respectively. Rest of World contains assets from the Republic of Korea, including those assets acquired as a part of our acquisition of Ticket Monster described in Note 3 "Business Combinations," of $388.0 million as of December 31, 2014. There were no other individual countries that represented more than 10% of consolidated total assets as of December 31, 2014 and 2013, respectively.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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