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Commitments and Contingencies Legal Matters (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2014
COMMITMENTS AND CONTINGENCIES [Abstract] |  |  |
Restatement of Prior Year Revenue | $ 14,300,000 grpn_RestatementOfPriorYearRevenue |  |
Restatement of Prior Year Operating Income | 30,000,000 grpn_RestatementOfPriorYearOperatingIncome |  |
Restatement of Prior Year Income, Net of Tax | 22,600,000 us-gaap_RestatementOfPriorYearIncomeNetOfTax |  |
Impact of Restatement on Earnings Per Share, Basic | $ 0.04 us-gaap_ImpactOfRestatementOnEarningsPerShareBasic |  |
Litigation Settlement, Expense |  | 8,500,000 us-gaap_LitigationSettlementExpense |
Loss Contingency, Range of Possible Loss, Maximum |  |  | $ 46,500,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum

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- Definition Restatement of Prior Year Operating Income - Resulting effect of revision to prior year financial statements + References No definition available. + Details
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- Definition Restatement of Prior Year Revenue - Resulting effect of revision to prior year financial statements + References No definition available. + Details
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- Definition Per share amount effect of a restatement of results of operations on basic earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e3842-109258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22644-107794 + Details
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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Resulting effect of restatement to correct an error, after tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22663-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22658-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22644-107794 + Details
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