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LEASES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Leases [Abstract] |  |  |
Total sublease rentals over the entire term |  | $ 18.2 |
Operating lease, impairment | $ 10.5 | $ 6.8 | $ 16.0
Finance lease, impairment | $ 1.3 |  |

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- Definition Lessor, Sublease Income, To Be Paid + References No definition available. + Details
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Namespace Prefix: | grpn_
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of impairment loss from 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 25 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918425-209957 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
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