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REVENUE RECOGNITION - Customer Credits (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Customer Credits [Roll Forward]
Customer credits, beginning balance	$ 61,006
Credits issued	50,051
Credits redeemed	(41,283)
Breakage revenue recognized	(6,205)
Foreign currency translation	(745)
Customer credits, ending balance	$ 62,824

X

- Definition

Credits to customers that can be applied to future purchases on our online marketplaces. Credits are primarily issued for refunds or for customer relationship purposes.

+ References

No definition available.

+ Details

Name:	grpn_CustomerCredits
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Customer Credits, Breakage Revenue Recognized

+ References

No definition available.

+ Details

Name:	grpn_CustomerCreditsBreakageRevenueRecognized
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Customer Credits, Credits Issued

+ References

No definition available.

+ Details

Name:	grpn_CustomerCreditsCreditsIssued
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Customer Credits, Credits Redeemed

+ References

No definition available.

+ Details

Name:	grpn_CustomerCreditsCreditsRedeemed
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Customer Credits, Foreign Currency Translation Gain (Loss)

+ References

No definition available.

+ Details

Name:	grpn_CustomerCreditsForeignCurrencyTranslationGainLoss
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Customer Credits

+ References

No definition available.

+ Details

Name:	grpn_CustomerCreditsRollForward
Namespace Prefix:	grpn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration