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

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- Details
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Namespace Prefix: | grpn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum share price required to prevent contigent obligation + References No definition available. + Details
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Namespace Prefix: | grpn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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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 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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Period Type: |