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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Inventory [Line Items] |  |
Inventory, Gross | $ 1,745,731 | $ 1,563,067
Summary of inventories |  |
Lower of cost or market reserves | (7,980) | (6,362)
New vehicles [Member] |  |
Inventory [Line Items] |  |
Inventory, Gross | 1,262,797 | 1,137,478
Used vehicles [Member] |  |
Inventory [Line Items] |  |
Inventory, Gross | 275,508 | 254,939
Rental vehicles [Member] |  |
Inventory [Line Items] |  |
Inventory, Gross | 134,509 | 103,184
Parts, accessories and other [Member] |  |
Inventory [Line Items] |  |
Inventory, Gross | $ 72,917 | $ 67,466

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