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Segment Information (Details) (USD $) In Thousands, 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 3 us-gaap_NumberOfReportableSegments |  |  |  |  |
Total revenue | $ 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 |
Segment cost of revenue and operating expenses |  |  |  |  |  |  |  |  | 3,083,242 us-gaap_CostsAndExpenses | [1] | 2,376,450 us-gaap_CostsAndExpenses | [1] | 2,130,757 us-gaap_CostsAndExpenses | [1]
Segment operating income (loss) |  |  |  |  |  |  |  |  | 108,446 grpn_SegmentOperatingLossIncome | [1] | 197,205 grpn_SegmentOperatingLossIncome | [1] | 203,715 grpn_SegmentOperatingLossIncome | [1]
Stock-based compensation |  |  |  |  |  |  |  |  | 122,019 us-gaap_ShareBasedCompensation |  | 121,462 us-gaap_ShareBasedCompensation |  | 104,117 us-gaap_ShareBasedCompensation |
Acquisition-related expense (benefit), net |  |  |  |  |  |  |  |  | 1,269 grpn_AcquisitionRelatedBenefitExpenseNet |  | (11)grpn_AcquisitionRelatedBenefitExpenseNet |  | 897 grpn_AcquisitionRelatedBenefitExpenseNet |
(Loss) income 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 |
Other expense, net |  |  |  |  |  |  |  |  | (33,353)us-gaap_OtherNonoperatingIncomeExpense |  | (94,663)us-gaap_OtherNonoperatingIncomeExpense |  | (3,759)us-gaap_OtherNonoperatingIncomeExpense |
(Loss) income before provision for income taxes |  |  |  |  |  |  |  |  | (48,195)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | (18,909)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 94,942 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
Provision for income taxes |  |  |  |  |  |  |  |  | 15,724 us-gaap_IncomeTaxExpenseBenefit |  | 70,037 us-gaap_IncomeTaxExpenseBenefit |  | 145,973 us-gaap_IncomeTaxExpenseBenefit |
Net loss |  |  |  |  |  |  |  |  | (63,919)us-gaap_ProfitLoss |  | (88,946)us-gaap_ProfitLoss |  | (51,031)us-gaap_ProfitLoss |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,784,600 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = country_US |  | 1,471,900 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = country_US |  | 1,108,400 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = country_US |
Switzerland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 468,700 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = country_CH |  |  |  |  |
North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,824,461 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [2] | 1,521,358 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [2] | 1,165,700 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [2]
Segment cost of revenue and operating expenses |  |  |  |  |  |  |  |  | 1,755,113 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1] | 1,380,746 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1] | 1,025,974 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1]
Segment operating income (loss) |  |  |  |  |  |  |  |  | 69,348 grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1] | 140,612 grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1] | 139,726 grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1]
Stock-based compensation |  |  |  |  |  |  |  |  | 99,939 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | 90,877 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | 65,127 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |
Acquisition-related expense (benefit), net |  |  |  |  |  |  |  |  | 1,125 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | 1,285 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | (2,780)grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |
EMEA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 961,130 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 742,915 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 805,476 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
Segment cost of revenue and operating expenses |  |  |  |  |  |  |  |  | 857,062 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1] | 631,409 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1] | 699,470 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1]
Segment operating income (loss) |  |  |  |  |  |  |  |  | 104,068 grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1] | 111,506 grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1] | 106,006 grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1]
Stock-based compensation |  |  |  |  |  |  |  |  | 9,927 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 16,263 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 15,123 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
Acquisition-related expense (benefit), net |  |  |  |  |  |  |  |  | 144 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | (1,296)grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 3,677 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
ROW [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 406,097 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | 309,382 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | 363,296 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
Segment cost of revenue and operating expenses |  |  |  |  |  |  |  |  | 471,067 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1] | 364,295 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1] | 405,313 us-gaap_CostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1]
Segment operating income (loss) |  |  |  |  |  |  |  |  | (64,970)grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1] | (54,913)grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1] | (42,017)grpn_SegmentOperatingLossIncome / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1]
Stock-based compensation |  |  |  |  |  |  |  |  | 12,153 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | 14,322 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | 23,867 us-gaap_ShareBasedCompensation / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
Acquisition-related expense (benefit), net |  |  |  |  |  |  |  |  | $ 0 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | $ 0 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | $ 0 grpn_AcquisitionRelatedBenefitExpenseNet / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember |  |  |  |  |
[1] | Segment cost of revenue and operating expenses and segment operating income (loss) exclude stock-based compensation and acquisition-related (benefit) expense, net. This presentation corresponds to the measure of segment profit or loss that the Company's chief operating decision-maker uses in assessing segment performance and making resource allocation decisions. The following table summarizes the Company's stock-based compensation expense and acquisition-related expense (benefit), net by reportable segment for the years ended December 31, 2014, 2013 and 2012. (in thousands): Year Ended December 31, 2014 2013 2012 Stock-based compensation Acquisition-related Stock-based compensation Acquisition-related Stock-based compensation Acquisition-relatedNorth America $99,939 $1,125 $90,877 $1,285 $65,127 $(2,780)EMEA 9,927 144 16,263 (1,296) 15,123 3,677Rest of World 12,153 — 14,322 — 23,867 —Consolidated $122,019 $1,269 $121,462 $(11) $104,117 $897Acquisition-related expense (benefit), net for the North America segment includes external transaction costs and gains and losses relating to contingent consideration obligations incurred by U.S. legal entities relating to purchases of businesses that became part of the EMEA and Rest of World segments, which is consistent with the attribution used for internal reporting purposes.
[2] | North America includes revenue from the United States of $1,784.6 million, $1,471.9 million and $1,108.4 million for the years ended December 31, 2014, 2013 and 2012 respectively. Beginning in September 2013, direct revenue transactions in the EMEA Goods category have been transacted through a Switzerland-based subsidiary. As a result, EMEA includes revenue from Switzerland of $468.7 million for the year ended December 31, 2014. There were no other individual countries that represented more than 10% of consolidated total revenue for the years ended December 31, 2014, 2013 or 2012.

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