Debt Instrument, Collateral, Percentage Of Outstanding Capital Stock, Domestic Subsidiaries

No definition available.

Name:	grpn_DebtInstrumentCollateralPercentageOfOutstandingCapitalStockDomesticSubsidiaries
Namespace Prefix:	grpn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Collateral, Percentage Of Outstanding Capital Stock, First Tier Foreign Subsidiaries

+ References

No definition available.

+ Details

Name:	grpn_DebtInstrumentCollateralPercentageOfOutstandingCapitalStockFirstTierForeignSubsidiaries
Namespace Prefix:	grpn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Commitment Fee, Daily Unused Commitments, Percentage

+ References

No definition available.

+ Details

Name:	grpn_DebtInstrumentCommitmentFeeDailyUnusedCommitmentsPercentage
Namespace Prefix:	grpn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Liquidity Required After Minimum

+ References

No definition available.

+ Details

Name:	grpn_LineOfCreditFacilityLiquidityRequiredAfterMinimum
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line Of Credit Facility, Maximum Funding Commitment

+ References

No definition available.

+ Details

Name:	grpn_LineOfCreditFacilityMaximumFundingCommitment
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Minimum Liquidity, Unrestricted Cash

+ References

No definition available.

+ Details

Name:	grpn_LineOfCreditFacilityMinimumLiquidityUnrestrictedCash
Namespace Prefix:	grpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line of Credit Facility, Minimum Liquidity, Unrestricted Cash As Percentage Of Accrued Merchant And Supplier Payables

+ References

No definition available.

+ Details

Name:	grpn_LineOfCreditFacilityMinimumLiquidityUnrestrictedCashAsPercentageOfAccruedMerchantAndSupplierPayables
Namespace Prefix:	grpn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Monthly Liquidity As Percentage Of Accrued Merchant And Supplier Payables

+ References

No definition available.

+ Details

Name:	grpn_LineOfCreditFacilityMonthlyLiquidityAsPercentageOfAccruedMerchantAndSupplierPayables
Namespace Prefix:	grpn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=grpn_A2020FirstAmendedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=grpn_CanadianPrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=grpn_FixedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grpn_A2019CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=grpn_A2021SecondAmendedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

FINANCING ARRANGEMENTS - Revolving Credit Facility (Details) - USD ($)	1 Months Ended		3 Months Ended
	Mar. 31, 2021	Jul. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	May 30, 2019
Debt Instrument [Line Items]
Amount of borrowings	$ 100,000,000.0		$ 100,000,000.0	$ 200,000,000.0
Outstanding letters of credit	$ 23,100,000		$ 23,100,000	$ 20,600,000
2020 First Amended Credit Agreement
Debt Instrument [Line Items]
Unused commitment fee percentage			0.40%
Maximum funding commitment		$ 225,000,000.0
Debt collateral, percentage of outstanding capital stock, domestic subsidiaries	100.00%		100.00%
Debt collateral, percentage of outstanding capital stock, first-tier foreign subsidiaries	65.00%		65.00%
2020 First Amended Credit Agreement \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Commitment fee percentage, daily amount of unused commitments		0.25%
2020 First Amended Credit Agreement \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage, daily amount of unused commitments		0.35%
2020 First Amended Credit Agreement \| Canadian Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
2020 First Amended Credit Agreement \| Fixed Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
2020 First Amended Credit Agreement \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%
Revolving Credit Facility \| 2019 Credit Agreement
Debt Instrument [Line Items]
Aggregate principal amount					$ 400,000,000.0
Revolving Credit Facility \| 2020 First Amended Credit Agreement
Debt Instrument [Line Items]
Aggregate principal amount		$ 225,000,000.0
Revolving Credit Facility \| 2021 Second Amended Credit Agreement
Debt Instrument [Line Items]
Debt issuance costs	$ 3,500,000		$ 3,500,000
Minimum liquidity as a percentage of accrued merchant and supplier payables required under debt agreement	70.00%
Monthly liquidity required as a percentage of accrued merchant and supplier payables required under debt agreement	100.00%
Monthly liquidity required in addition to minimum	$ 50,000,000.0		50,000,000.0
Minimum liquidity required under debt agreement	$ 250,000,000		$ 250,000,000
Letter of Credit \| 2020 First Amended Credit Agreement
Debt Instrument [Line Items]
Aggregate principal amount		$ 75,000,000.0