XML 70 R54.htm IDEA: XBRL DOCUMENT v3.22.4

BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF ACCOUNTING POLICIES - Advertising (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Advertising expense	$ 76.5	$ 65.8	$ 49.0
Reduction in advertising expense for advertising assistance earned related to vehicles sold	$ 17.4	$ 14.9	$ 13.0

X

- Definition

Manufacturer advertising assistance recognized as a reduction of advertising expense.

+ References

No definition available.

+ Details

Name:	gpi_ManufacturerAdvertisingAssistanceRecognizedAsAReductionOfAdvertisingExpense
Namespace Prefix:	gpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

Name:	us-gaap_AdvertisingExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration