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Quarterly Results (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Results [Abstract]
Revenues	$ 925,421us-gaap_Revenues	$ 757,054us-gaap_Revenues	$ 751,576us-gaap_Revenues	$ 757,637us-gaap_Revenues	$ 768,447us-gaap_Revenues		$ 595,059us-gaap_Revenues	$ 608,747us-gaap_Revenues	$ 601,402us-gaap_Revenues	$ 3,191,688us-gaap_Revenues	$ 2,573,655us-gaap_Revenues	$ 2,334,472us-gaap_Revenues
Cost of revenue	531,962us-gaap_CostOfRevenue	376,910us-gaap_CostOfRevenue	361,714us-gaap_CostOfRevenue	371,916us-gaap_CostOfRevenue	390,239us-gaap_CostOfRevenue		235,437us-gaap_CostOfRevenue	224,053us-gaap_CostOfRevenue	222,393us-gaap_CostOfRevenue	1,642,502us-gaap_CostOfRevenue	1,072,122us-gaap_CostOfRevenue	718,940us-gaap_CostOfRevenue
Gross profit	393,459us-gaap_GrossProfit	380,144us-gaap_GrossProfit	389,862us-gaap_GrossProfit	385,721us-gaap_GrossProfit	378,208us-gaap_GrossProfit		359,622us-gaap_GrossProfit	384,694us-gaap_GrossProfit	379,009us-gaap_GrossProfit	1,549,186us-gaap_GrossProfit	1,501,533us-gaap_GrossProfit	1,615,532us-gaap_GrossProfit
Income (loss) from operations	18,394us-gaap_OperatingIncomeLoss	(5,429)us-gaap_OperatingIncomeLoss	(7,854)us-gaap_OperatingIncomeLoss	(19,953)us-gaap_OperatingIncomeLoss	13,352us-gaap_OperatingIncomeLoss		13,812us-gaap_OperatingIncomeLoss	27,412us-gaap_OperatingIncomeLoss	21,178us-gaap_OperatingIncomeLoss	(14,842)us-gaap_OperatingIncomeLoss	75,754us-gaap_OperatingIncomeLoss	98,701us-gaap_OperatingIncomeLoss
Net income (loss)	11,384us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(19,018)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(20,922)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(35,363)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(78,861)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	[1]	(1,292)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(5,551)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(3,242)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(73,090)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(95,393)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(67,377)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss) attributable to Groupon, Inc.	8,788us-gaap_NetIncomeLoss	(21,208)us-gaap_NetIncomeLoss	(22,875)us-gaap_NetIncomeLoss	(37,795)us-gaap_NetIncomeLoss	(81,247)us-gaap_NetIncomeLoss	[1]	(2,580)us-gaap_NetIncomeLoss	(7,574)us-gaap_NetIncomeLoss	(3,992)us-gaap_NetIncomeLoss	(73,090)us-gaap_NetIncomeLoss	(95,393)us-gaap_NetIncomeLoss	(54,773)us-gaap_NetIncomeLoss
Basic, net (loss) earnings per share	$ 0.01us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.12)us-gaap_EarningsPerShareBasic		$ 0.00us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.11)us-gaap_EarningsPerShareBasic	$ (0.14)us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic
Diluted, net (loss) earnings per share	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.12)us-gaap_EarningsPerShareDiluted		$ 0.00us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.11)us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted
Basic, weighted average number of shares outstanding	671,885,967us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	669,526,524us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	675,538,392us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	682,378,690us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	668,046,073us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		666,432,848us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	662,361,436us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	658,800,417us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	674,832,393us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	663,910,194us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	650,214,119us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted, weighted average number of shares outstanding	681,543,847us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	669,526,524us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	675,538,392us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	682,378,690us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	668,046,073us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		666,432,848us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	662,361,436us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	658,800,417us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	674,832,393us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	663,910,194us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	650,214,119us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Effect of Fourth Quarter Events [Line Items]
Other than Temporary Impairment Losses, Investments					85,500us-gaap_ImpairmentOfInvestments					2,036us-gaap_ImpairmentOfInvestments	85,925us-gaap_ImpairmentOfInvestments	50,553us-gaap_ImpairmentOfInvestments
Impairment of investments					$ 77,800us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet					$ 2,036us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	$ 85,925us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	$ 50,553us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
[1] (1)Net loss and net loss attributable to Groupon, Inc. for the quarter ended December 31, 2013 included an impairment of the Company's investment in F-tuan of $85.5 million ($77.8 million, net of tax). See Note 6 "Investments."

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