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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	$ 14,300,000grpn_RestatementOfPriorYearRevenue
Restatement of Prior Year Operating Income	30,000,000grpn_RestatementOfPriorYearOperatingIncome
Restatement of Prior Year Income, Net of Tax	22,600,000us-gaap_RestatementOfPriorYearIncomeNetOfTax
Impact of Restatement on Earnings Per Share, Basic	$ 0.04us-gaap_ImpactOfRestatementOnEarningsPerShareBasic
Litigation Settlement, Expense		8,500,000us-gaap_LitigationSettlementExpense
Loss Contingency, Range of Possible Loss, Maximum			$ 46,500,000us-gaap_LossContingencyRangeOfPossibleLossMaximum

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Restatement of Prior Year Operating Income - Resulting effect of revision to prior year financial statements

+ References

No definition available.

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Restatement of Prior Year Revenue - Resulting effect of revision to prior year financial statements

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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



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-Section 50

-Paragraph 7

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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The estimated maximum amount of possible loss from the contingency.

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-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



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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 9

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