Quarterly report pursuant to Section 13 or 15(d)

Inventories - Components of Inventories (Detail)

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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
New vehicles $ 998,481 $ 924,818
Used vehicles 247,260 214,015
Service loaners 115,517 112,520
Parts, accessories and other 61,175 60,349
Net inventories $ 1,422,433 $ 1,311,702