XML 88 R101.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Commitments and Contingencies (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Lessee rental payment obligations during remaining terms of leases under guarantee agreement		$ 38.6
Letters of credit issued on behalf of lessee	$ 7.1

X

- Definition

Guarantor Obligations, Maximum Exposure Inestimable, Minimum Lease Payments Guaranteed

+ References

No definition available.

+ Details

Name:	gpi_GuarantorObligationsMaximumExposureInestimableMinimumLeasePaymentsGuaranteed
Namespace Prefix:	gpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Letters of Credit Outstanding as Beneficiary

+ References

No definition available.

+ Details

Name:	gpi_LettersofCreditOutstandingasBeneficiary
Namespace Prefix:	gpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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