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Commitments and Contingencies Legal Matters (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Mar. 09, 2017
--- | --- | ---
Loss Contingencies [Line Items] |  |
Indemnification Liability, Maximum Exposure | $ 25.0 |
Groupon Latin America [Member] |  |
Loss Contingencies [Line Items] |  |
Indemnification Liability |  | $ 5.4

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- Definition Indemnification Liability + References No definition available. + Details
Name: | grpn_IndemnificationLiability
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indemnification Liability, Maximum Exposure + References No definition available. + Details
Name: | grpn_IndemnificationLiabilityMaximumExposure
Namespace Prefix: | grpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=grpn_GrouponLatinAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |