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VARIABLE INTEREST ENTITY (Details)	12 Months Ended
	Dec. 31, 2020
Variable Interest Entity [Abstract]
Variable interest entity, ownership percentage	50.00%

X

- Definition

Variable Interest Entity [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration