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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
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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 | $ 3.9 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent | $ 16.7 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent |
Cash Payment [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent |  | 14.1 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember | 2.0 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember
Stock-based compensation awards settlement |  | 14.0 grpn_Stockbasedcompensationawardssettlement / us-gaap_ConsolidationItemsAxis = grpn_CashPaymentMember | 1.2 grpn_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 |  | 0.6 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_CommonClassAMember |
Stock-based compensation awards settlement |  | 2.3 grpn_Stockbasedcompensationawardssettlement / us-gaap_ConsolidationItemsAxis = us-gaap_CommonClassAMember |
Deferred Compensation, Share-based Payments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | 10.5 us-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 | 2.3 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_CashMember | 16.1 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_CashMember |
Stock-based compensation awards settlement |  | 15.2 grpn_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 | 1.0 us-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 | $ 0.6 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent / us-gaap_ConsolidationItemsAxis = us-gaap_OtherNoncurrentLiabilitiesMember |  |

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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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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