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, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
New vehicles $ 894,382 $ 1,088,814
Used vehicles 296,929 282,288
Service loaners 130,657 128,821
Parts, accessories and other 68,085 70,778
Net inventories $ 1,390,053 $ 1,570,701