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INVENTORIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Lower of cost or net realizable value reserves	$ 14.1	$ 9.2
Reduction in inventory cost for interest received from manufacturers	8.0	7.0
Reduction in new vehicle cost of sales for interest assistance received related to vehicles sold	88.4	71.2	$ 56.0
Impairment of inventory	$ 2.7	$ 3.4	$ 0.3

X

- Definition

Manufacturer floorplan assistance recognized as reduction of cost of sales.

+ References

No definition available.

+ Details

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X

- Definition

Manufacturer floorplan assistance recognized as reduction of inventory cost.

+ References

No definition available.

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Namespace Prefix:	gpi_
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X

- References

No definition available.

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X

- Definition

Amount of valuation reserve for inventory.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.BB)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-2

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