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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 943,825 | $ 938,263
Used vehicles | 193,223 | 171,909
Service loaners | 112,076 | 108,136
Parts, accessories and other | 64,755 | 63,830
Subtotal | 1,313,879 | 1,282,138
Subtotal | 1,313,879 | 1,282,138
Less inventories classified as assets held for sale | (11,820) |
Net inventories | $ 1,302,059 | $ 1,282,138

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- Definition Carrying amount as of the balance sheet date of inventories classified as held for sale that are segregated from normal operations and that are anticipated to be sold within one year (or in the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 + Details
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