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SUPPLEMENTAL CONDENSED CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accrued Merchant and Supplier Payables (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract] |  |
Accrued merchant payables | $ 215,365 | $ 303,260
Accrued supplier payables | 14,546 | 107,703
Total accrued merchant and supplier payables | $ 229,911 | $ 410,963

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- Definition Accrued Merchant and Supplier Payable + References No definition available. + Details
Name: | grpn_AccruedMerchantAndSupplierPayable
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued Merchant Payables + References No definition available. + Details
Name: | grpn_AccruedMerchantPayables
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued Supplier Payables + References No definition available. + Details
Name: | grpn_AccruedSupplierPayables
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract] + References No definition available. + Details
Name: | grpn_SupplementalConsolidatedBalanceSheetStatementofOperationsInformationAbstract
Namespace Prefix: | grpn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration