BASIS OF PRESENTATION AND CONSOLIDATION AND ACCOUNTING POLICIES -Basis of Presentation and Consolidation (Details)	Jul. 01, 2022
Held-for-sale \| Brazil
Business And Organization
Percentage of equity interest relinquished	100.00%

Discontinued Operations, Equity Interest Relinquished

No definition available.

Name:	gpi_DiscontinuedOperationsEquityInterestRelinquished
Namespace Prefix:	gpi_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant