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REVENUE RECOGNITION - Liability for Customer Credits Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Movement in Customer Refundable Fees [Roll Forward] |  |
Customer credits, beginning balance | $ 13,764 | $ 15,118
Credits issued | 213,826 | 115,031
Credits redeemed | (147,096) | (102,682)
Breakage revenue recognized | (21,364) | (13,699)
Foreign currency translation | 1,876 | (4)
Customer credits, ending balance | $ 61,006 | $ 13,764

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- 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

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- 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

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- 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

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

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- Definition Customer Credits, Foreign Currency Translation + References No definition available. + Details
Name: | grpn_CustomerCreditsForeignCurrencyTranslation
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInCustomerRefundableFeesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration