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Fair Value Measurements Fair Value, Reconciliation of Level 3 - Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Convertible Debt |  |  | $ 370 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases |  | $ 3,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | (1,340)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |
Cost Method Investments |  |  | 34982 |  | 56940 |
Convertible debt securities [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
AFS Securities, Beginning Asset Value | 3,174 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 3,087 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |
AFS Debt Security, (losses) included in OCI | 693 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | (283)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 87 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | (1,340)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |
AFS Securities, Ending Asset Value | 2,527 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 3,174 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |  | 3,087 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember |
Unrealized Gains (Losses) Still Held - Assets | (647)grpn_UnrealizedGainsLossesStillHeldAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember | [1] | (283)grpn_UnrealizedGainsLossesStillHeldAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember | [1] | 87 grpn_UnrealizedGainsLossesStillHeldAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember | [1]
Redeemable preferred shares [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
AFS Securities, Beginning Asset Value | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 42,539 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |
AFS Debt Security, (losses) included in OCI | 311 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |
AFS Securities, Ending Asset Value | 4,910 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 42,539 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |
Unrealized Gains (Losses) Still Held - Assets | 311 grpn_UnrealizedGainsLossesStillHeldAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember | [1] | (85,521)grpn_UnrealizedGainsLossesStillHeldAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember | [1] | (14,401)grpn_UnrealizedGainsLossesStillHeldAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember | [1]
Purchase of redeemable preferred shares | 4,599 grpn_Purchaseofredeemablepreferredshares / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 8,000 grpn_Purchaseofredeemablepreferredshares / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | 0 grpn_Purchaseofredeemablepreferredshares / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  |  | $ (85,521)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |  | $ (14,401)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember |
[1] | Represents the unrealized losses or gains recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

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- Definition Purchase of redeemable preferred shares + References No definition available. + Details
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- Definition Unrealized Gains (Losses) Still Held - Assets + References No definition available. + Details
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- Definition This serves as a place to record data that is not specified elsewhere in the taxonomy but is useful for readers of the financial statements as it relates to the details of cost method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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