XML 45 R35.htm IDEA: XBRL DOCUMENT v3.22.1

BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES -Basis of Presentation and Consolidation (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022 segment	Mar. 31, 2021 segment	Dec. 31, 2021 segment	Nov. 12, 2021 USD ($)
Business And Organization
Number of reportable segments | segment	2	2	2
Scenario, Plan | Held-for-sale | Brazil
Business And Organization
Percentage of equity interest relinquished				100.00%
Consideration for disposal | $				$ 510.0

X

- Definition

Business And Organization [Line Items]

+ References

No definition available.

+ Details

Name:	gpi_BusinessAndOrganizationLineItems
Namespace Prefix:	gpi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Discontinued Operations, Equity Interest Relinquished

+ References

No definition available.

+ Details

Name:	gpi_DiscontinuedOperationsEquityInterestRelinquished
Namespace Prefix:	gpi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=gpi_BrazilSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: