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Inventories - Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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Dec. 31, 2014
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| Inventory Disclosure [Abstract] | ||
| New vehicles | $ 856,967sah_InventoryNewVehicles | $ 924,818sah_InventoryNewVehicles |
| Used vehicles | 246,713sah_InventoryUsedVehicles | 214,015sah_InventoryUsedVehicles |
| Service loaners | 115,741sah_InventoryServiceLoaners | 112,520sah_InventoryServiceLoaners |
| Parts, accessories and other | 60,606us-gaap_OtherInventoriesSpareParts | 60,349us-gaap_OtherInventoriesSpareParts |
| Net inventories | $ 1,280,027us-gaap_InventoryNet | $ 1,311,702us-gaap_InventoryNet |
| X | ||||||||||
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- Definition
Inventory new vehicles. No definition available.
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| X | ||||||||||
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- Definition
Inventory service loaners. No definition available.
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| X | ||||||||||
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- Definition
Inventory used vehicles. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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