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Goodwill and Other Intangible Assets Goodwill Activity by Segment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | $ 220,827 us-gaap_Goodwill |  | $ 206,684 us-gaap_Goodwill |
Goodwill, related to acquisitions | 250,045 us-gaap_GoodwillAcquiredDuringPeriod |  | 9,504 us-gaap_GoodwillAcquiredDuringPeriod |
Goodwill, other adjustments | (23,062)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | [1] | 4,639 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | [1]
Goodwill, end of period | 447,810 us-gaap_Goodwill |  | 220,827 us-gaap_Goodwill |
North America [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | 85,457 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | 79,276 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |
Reallocation to new segments |  |  | 0 grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |
Goodwill, related to acquisitions | 31,353 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | 4,893 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |
Goodwill, other adjustments | (92)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1] | 1,288 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | [1]
Goodwill, end of period | 116,718 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  | 85,457 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |
International [Domain] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |  | 127,408 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |
Reallocation to new segments |  |  | (124,770)grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |
Goodwill, related to acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |
Goodwill, other adjustments | 0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain | [1] | (2,638)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain | [1]
Goodwill, end of period | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain |
EMEA [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | 115,669 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
Reallocation to new segments |  |  | (105,347)grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
Goodwill, related to acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 4,611 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
Goodwill, other adjustments | (13,490)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1] | 5,711 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember | [1]
Goodwill, end of period | 102,179 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |  | 115,669 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember |
ROW [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning of period | 19,701 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
Reallocation to new segments |  |  | (19,423)grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
Goodwill, related to acquisitions | 218,692 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
Goodwill, other adjustments | (9,480)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1] | 278 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember | [1]
Goodwill, end of period | $ 228,913 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |  | $ 19,701 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember |
[1] | (1)Represents the impact of changes in foreign exchange rates on goodwill.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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