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Property and Equipment - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Line Items] |  |
Total, at cost | $ 1,761,071 | $ 1,677,749
Less accumulated depreciation | (575,720) | (527,379)
Subtotal | 1,185,351 | 1,150,370
Less assets held for sale | (6,862) | (3,489)
Property and equipment, net | 1,178,489 | 1,146,881
Land |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | 381,527 | 370,828
Building and improvements |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | 989,872 | 893,768
Software and computer equipment |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | 116,348 | 147,812
Parts and service equipment |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | 108,040 | 105,123
Office equipment and fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | 96,622 | 96,066
Company vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | 9,139 | 9,723
Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Total, at cost | $ 59,523 | $ 54,429

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