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Property and Equipment - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Property Plant And Equipment [Line Items] |  |
Total, at cost | $ 1,677,749 | $ 1,464,795
Less accumulated depreciation | (527,379) | (450,184)
Subtotal | 1,150,370 | 1,014,611
Less assets held for sale | (3,489) | (4,231)
Property and equipment, net | 1,146,881 | 1,010,380
Land [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | 370,828 | 306,457
Building and Improvements [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | 893,768 | 777,766
Software and Computer Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | 147,812 | 128,366
Office Equipment and Fixtures [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | 96,066 | 86,216
Parts and Service Equipment [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | 105,123 | 93,901
Company Vehicles [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | 9,723 | 9,107
Construction in Progress [Member] |  |
Property Plant And Equipment [Line Items] |  |
Total, at cost | $ 54,429 | $ 62,982

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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