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Fair Value Measurements Fair Value, Reconciliation of Level 3 - Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Convertible Debt			$ 370us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases		$ 3,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	(1,340)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities		0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities		0us-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	3,174us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		3,087us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember
AFS Debt Security, (losses) included in OCI	693us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		(283)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		87us-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		0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember
AFS Securities, Ending Asset Value	2,527us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		3,174us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ConvertibleDebtSecuritiesMember		3,087us-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]	87grpn_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	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		42,539us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember
AFS Debt Security, (losses) included in OCI	311us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember
AFS Securities, Ending Asset Value	4,910us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		42,539us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember
Unrealized Gains (Losses) Still Held - Assets	311grpn_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	4,599grpn_Purchaseofredeemablepreferredshares / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		8,000grpn_Purchaseofredeemablepreferredshares / us-gaap_FairValueByAssetClassAxis = us-gaap_RedeemablePreferredStockMember		0grpn_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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Purchase of redeemable preferred shares

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Unrealized Gains (Losses) Still Held - Assets

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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

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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

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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)

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Fair value 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

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-Publisher FASB

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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

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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

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