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, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
New vehicles $ 1,056,560 $ 1,161,490
Used vehicles 342,974 251,103
Service loaners 125,257 121,946
Parts, accessories and other 65,425 65,042
Net inventories $ 1,590,216 $ 1,599,581