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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Amount of valuation reserve for inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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