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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2017
Recorded Unconditional Purchase Obligation [Line Items]
Indemnification liabilities	$ 2.8
Maximum exposure of indemnification liability	$ 11.7
Groupon Latin America
Recorded Unconditional Purchase Obligation [Line Items]
Estimated indemnification liability		$ 5.4

X

- Definition

Indemnification Liabilities Assumed

+ References

No definition available.

+ Details

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

X

- Definition

Indemnification Liability

+ References

No definition available.

+ Details

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

X

- Definition

Indemnification Liability, Estimated Maximum Exposure

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: