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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	$ 220,827us-gaap_Goodwill		$ 206,684us-gaap_Goodwill
Goodwill, related to acquisitions	250,045us-gaap_GoodwillAcquiredDuringPeriod		9,504us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, other adjustments	(23,062)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments	[1]	4,639us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments	[1]
Goodwill, end of period	447,810us-gaap_Goodwill		220,827us-gaap_Goodwill
North America [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	85,457us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember		79,276us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember
Reallocation to new segments			0grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember
Goodwill, related to acquisitions	31,353us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember		4,893us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember
Goodwill, other adjustments	(92)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember	[1]	1,288us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember	[1]
Goodwill, end of period	116,718us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember		85,457us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember
International [Domain]
Goodwill [Roll Forward]
Goodwill, beginning of period	0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain		127,408us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain
Reallocation to new segments			(124,770)grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain
Goodwill, related to acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain		0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain
Goodwill, other adjustments	0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain	[1]	(2,638)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain	[1]
Goodwill, end of period	0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain		0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_InternationalDomain
EMEA [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	115,669us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember		0us-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	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember		4,611us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember
Goodwill, other adjustments	(13,490)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember	[1]	5,711us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember	[1]
Goodwill, end of period	102,179us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember		115,669us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember
ROW [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	19,701us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember		0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember
Reallocation to new segments			(19,423)grpn_Reallocationtonewsegments / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember
Goodwill, related to acquisitions	218,692us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember		0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember
Goodwill, other adjustments	(9,480)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember	[1]	278us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember	[1]
Goodwill, end of period	$ 228,913us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = grpn_RowMember		$ 19,701us-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

2012 Reallocation of Goodwill from International to EMEA and ROW

+ References

No definition available.

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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



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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.

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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

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