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Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 1,017,523 | $ 1,088,814
Used vehicles | 294,496 | 282,288
Service loaners | 130,406 | 128,821
Parts, accessories and other | 70,320 | 70,778
Net inventories | $ 1,512,745 | $ 1,570,701

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details
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