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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, 2020 | Dec. 31, 2019
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Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract] |  |
Accrued merchant payables | $ 297,018 | $ 366,573
Accrued supplier payables | 84,838 | 174,367
Total accrued merchant and supplier payables | $ 381,856 | $ 540,940

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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 Merchant payables + References No definition available. + Details
Name: | grpn_Merchantpayables
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Payables to suppliers of inventories + References No definition available. + Details
Name: | grpn_Payablestosuppliersofinventories
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