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REVENUE RECOGNITION - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018 number_of_day
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, billing cycle	30
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, billing cycle	150

X

- Definition

Contract With Customer, Billing Cycle

+ References

No definition available.

+ Details

Name:	grpn_ContractWithCustomerBillingCycle
Namespace Prefix:	grpn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: