Annual report pursuant to Section 13 and 15(d)

Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Detail)

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Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
New vehicles $ 1,088,814 $ 1,161,490
Used vehicles 282,288 251,103
Service loaners 128,821 121,946
Parts, accessories and other 70,778 65,042
Net inventories $ 1,570,701 $ 1,599,581