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Quarterly Results (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 | $ 925,421 us-gaap_Revenues | $ 757,054 us-gaap_Revenues | $ 751,576 us-gaap_Revenues | $ 757,637 us-gaap_Revenues | $ 768,447 us-gaap_Revenues |  | $ 595,059 us-gaap_Revenues | $ 608,747 us-gaap_Revenues | $ 601,402 us-gaap_Revenues | $ 3,191,688 us-gaap_Revenues | $ 2,573,655 us-gaap_Revenues | $ 2,334,472 us-gaap_Revenues
Cost of revenue | 531,962 us-gaap_CostOfRevenue | 376,910 us-gaap_CostOfRevenue | 361,714 us-gaap_CostOfRevenue | 371,916 us-gaap_CostOfRevenue | 390,239 us-gaap_CostOfRevenue |  | 235,437 us-gaap_CostOfRevenue | 224,053 us-gaap_CostOfRevenue | 222,393 us-gaap_CostOfRevenue | 1,642,502 us-gaap_CostOfRevenue | 1,072,122 us-gaap_CostOfRevenue | 718,940 us-gaap_CostOfRevenue
Gross profit | 393,459 us-gaap_GrossProfit | 380,144 us-gaap_GrossProfit | 389,862 us-gaap_GrossProfit | 385,721 us-gaap_GrossProfit | 378,208 us-gaap_GrossProfit |  | 359,622 us-gaap_GrossProfit | 384,694 us-gaap_GrossProfit | 379,009 us-gaap_GrossProfit | 1,549,186 us-gaap_GrossProfit | 1,501,533 us-gaap_GrossProfit | 1,615,532 us-gaap_GrossProfit
Income (loss) from operations | 18,394 us-gaap_OperatingIncomeLoss | (5,429)us-gaap_OperatingIncomeLoss | (7,854)us-gaap_OperatingIncomeLoss | (19,953)us-gaap_OperatingIncomeLoss | 13,352 us-gaap_OperatingIncomeLoss |  | 13,812 us-gaap_OperatingIncomeLoss | 27,412 us-gaap_OperatingIncomeLoss | 21,178 us-gaap_OperatingIncomeLoss | (14,842)us-gaap_OperatingIncomeLoss | 75,754 us-gaap_OperatingIncomeLoss | 98,701 us-gaap_OperatingIncomeLoss
Net income (loss) | 11,384 us-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. | 8,788 us-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 | $ 0.01 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic | $ (0.12)us-gaap_EarningsPerShareBasic |  | $ 0.00 us-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 | $ 0.01 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted | $ (0.12)us-gaap_EarningsPerShareDiluted |  | $ 0.00 us-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 | 671,885,967 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 669,526,524 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 675,538,392 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 682,378,690 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 668,046,073 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 666,432,848 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 662,361,436 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 658,800,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 674,832,393 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 663,910,194 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 650,214,119 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted, weighted average number of shares outstanding | 681,543,847 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 669,526,524 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 675,538,392 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 682,378,690 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 668,046,073 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 666,432,848 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 662,361,436 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 658,800,417 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 674,832,393 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 663,910,194 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 650,214,119 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  |  |  | 85,500 us-gaap_ImpairmentOfInvestments |  |  |  |  | 2,036 us-gaap_ImpairmentOfInvestments | 85,925 us-gaap_ImpairmentOfInvestments | 50,553 us-gaap_ImpairmentOfInvestments
Impairment of investments |  |  |  |  | $ 77,800 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |  |  |  |  | $ 2,036 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ 85,925 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet | $ 50,553 us-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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