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Business Combinations and Acquisitions of Noncontrolling Interests Business Combinations and Acquisitions of Noncontrolling interests Purchases of Additional Interests in Consolidated Subsidiaries (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Business Acquisition [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	$ 3.9us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	$ 16.7us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
Cash Payment [Member]
Business Acquisition [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent		14.1us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember	2.0us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember
Stock-based compensation awards settlement		14.0grpn_Stockbasedcompensationawardssettlement / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember	1.2grpn_Stockbasedcompensationawardssettlement / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember
Common Class A [Member]
Business Acquisition [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent		0.6us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_CommonClassAMember
Stock-based compensation awards settlement		2.3grpn_Stockbasedcompensationawardssettlement / us-gaap_ConsolidationItemsAxis = us-gaap_CommonClassAMember
Deferred Compensation, Share-based Payments [Member]
Business Acquisition [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense		10.5us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember
Cash [Member]
Business Acquisition [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	2.3us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_CashMember	16.1us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_CashMember
Stock-based compensation awards settlement		15.2grpn_Stockbasedcompensationawardssettlement / us-gaap_ConsolidationItemsAxis = us-gaap_CashMember
Other Current Liabilities [Member]
Business Acquisition [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	1.0us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_OtherCurrentLiabilitiesMember
Other Noncurrent Liabilities [Member]
Business Acquisition [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	$ 0.6us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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- Definition

Stock-based compensation awards settlement

+ References

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- Definition

Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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