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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories [Line Items]
Inventory, Gross	$ 1,563,067us-gaap_InventoryGross	$ 1,549,974us-gaap_InventoryGross
Summary of inventories
Inventories, net	1,556,705us-gaap_InventoryNet	1,542,318us-gaap_InventoryNet
Lower of cost or market reserves	(6,362)us-gaap_InventoryValuationReserves	(7,656)us-gaap_InventoryValuationReserves
New vehicles [Member]
Inventories [Line Items]
Inventory, Gross	1,137,478us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_NewVehiclesMember	1,165,335us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_NewVehiclesMember
Used vehicles [Member]
Inventories [Line Items]
Inventory, Gross	254,939us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_UsedVehiclesMember	231,960us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_UsedVehiclesMember
Rental vehicles [Member]
Inventories [Line Items]
Inventory, Gross	103,184us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_RentalVehiclesMember	88,523us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_RentalVehiclesMember
Parts, accessories and other [Member]
Inventories [Line Items]
Inventory, Gross	$ 67,466us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_PartsAccessoriesAndOtherMember	$ 64,156us-gaap_InventoryGross / gpi_InventoriesAxis = gpi_PartsAccessoriesAndOtherMember

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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