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LEASES - Right-of-Use Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Right-of-use assets - operating leases | $ 107,509 | $ 133,832
Right-of-use assets - finance leases | 21,523 | 28,193
Total right-of-use assets, gross | 129,032 | 162,025
Less: accumulated depreciation and amortization | (44,590) | (36,380)
Right-of-use assets, net | $ 84,442 | $ 125,645

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- Definition Accumulated Amortization, Right-of-use Assets + References No definition available. + Details
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Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease, Right of Use Asset + References No definition available. + Details
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Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lease, Right of Use Asset, Net + References No definition available. + Details
Name: | grpn_LeaseRightofUseAssetNet
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant