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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Asset impairment charges	$ 16,500	$ 23,200	$ 4,300	$ 10,000	$ 9,500	$ 43,883	$ 19,506	$ 32,838
Net pre-tax gain (loss) on dealership dispositions			$ 20,200
Chargeback reserves for finance and insurance revenues related to catastrophic events					$ 14,700
Provisional tax benefit related to re-measurement of deferred tax assets and liabilities as a result of the U.S. tax reform bill	$ 73,000