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
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
New vehicles $ 1,116,708 $ 1,088,814
Used vehicles 301,283 282,288
Service loaners 133,552 128,821
Parts, accessories and other 70,795 70,778
Net inventories $ 1,622,338 $ 1,570,701