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Fair Value Measurements Contingent Obligations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Contingent Obligations [Abstract]
Minimum share price required to prevent contigent obligation	$ 6.48grpn_Minimumsharepricerequiredtopreventcontigentobligation
Other Acquisition 1 [Member]
Contingent Obligations [Abstract]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High	$ 1,100us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInTheRangeOfOutcomesContingentConsiderationLiabilityValueHigh / us-gaap_BusinessAcquisitionAxis = grpn_OtherAcquisition1Member

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- Definition

Minimum share price required to prevent contigent obligation

+ References

No definition available.

+ Details

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- Definition

This element represents the amount of any change recognized during the period in the high-end of the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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