Cost Method Ownership Percentage - The Company's aggregate percent ownership of cost method investment.

No definition available.

Name:	grpn_CostMethodOwnershipPercentage
Namespace Prefix:	grpn_
Data Type:	num:percentItemType
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- Definition

investment Cost Method and AFS Debt Security

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Payments to Acquire Cost Method Investment

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

Name:	invest_InvestmentLineItems
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ 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 (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

+ Details

Name:	us-gaap_GainLossOnSaleOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount by which the fair value of an investment 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 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

Name:	grpn_PaymentInstallmentsAxis=grpn_August2013Domain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	grpn_PaymentInstallmentsAxis=grpn_October2013DomainDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=grpn_EcommerceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=grpn_FTuanMember
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Investments Investments in E-Commerce and Life Media (F-Tuan) (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Mar. 31, 2013	Sep. 30, 2013
Investment [Line Items]
Payments to Acquire Cost Method Investment		$ 25,000,000				$ 2,100,000.0	$ 13,600,000
Gain (Loss) on Investments					56,032,000us-gaap_GainLossOnSaleOfInvestments
Fair Value Inputs, Discount Rate		25.00%us-gaap_FairValueInputsDiscountRate			30.00%us-gaap_FairValueInputsDiscountRate
investment Cost Method and AFS Debt Security					77,500,000
Other than Temporary Impairment Losses, Investments	85,500,000us-gaap_ImpairmentOfInvestments		2,036,000us-gaap_ImpairmentOfInvestments	85,925,000us-gaap_ImpairmentOfInvestments	50,553,000us-gaap_ImpairmentOfInvestments
E-commerce [Member]
Investment [Line Items]
Equity Method Investments, Ownership Percentage		49.80%
F-Tuan [Member]
Investment [Line Items]
Payments to Acquire Cost Method Investment		25,000,000						8,000,000
Cost Method Investments, Ownership Percentage	19.10%	19.10%		19.10%
Preferred Stock, Liquidation Preference, Value	85,500,000			85,500,000
Other than Temporary Impairment Losses, Investments				85,500,000	50,600,000
August 2013 [Domain] \| F-Tuan [Member]
Investment [Line Items]
Payments to Acquire Cost Method Investment								6,500,000
October 2013 [Domain] [Domain] \| F-Tuan [Member]
Investment [Line Items]
Payments to Acquire Cost Method Investment	$ 1,500,000			$ 1,500,000