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Property and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Capital expenditures incurred | $ 110,100 | $ 98,300 |
Capital expenditures accrued | 9,248 | 8,759 | $ 15,930
Fixed assets acquired | 31,400 | 110,400 |
Asset impairments related to property and equipment | 5,100 | 200 |
Depreciation and amortization expense, including amortization of capital leases | 67,100 | 57,900 | 51,200
Buildings under capital leases were recorded as property and equipment, before accumulated depreciation | 68,800 | $ 77,400 |
Held-for-Sale |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment | 10,600 |  |
Dealership Acquisitions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Fixed assets acquired | $ 22,400 |  | $ 29,000

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