Statements of Cash Flows - Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash paid during the period for:
Interest		$ 65,202	$ 61,889	$ 54,843
Income taxes		35,432	1,622	1,119
Non-cash investing activities:
Property and equipment for leases capitalized as a right to use asset				50,587
Derecognized property and equipment for leases that qualified as operating leases after completion of construction	$ (122,400)	(20,100)	(19,958)	(122,360)
Property and equipment acquired through third party capital lease arrangements			2,007
Leasehold improvements paid by lessor		857
Vehicles transferred to property and equipment from inventory		1,555	530	3,703
Portion of acquisition purchase price paid through issuance of Class A common stock		5,720
Landlord paid tenant improvements on behalf of the Company		749
Non-cash financing activities:
Lease obligations recognized as right to use liabilities				50,587
Derecognized right to use liabilities for leases that qualified as operating leases after completion of construction	$ (127,000)	(20,000)	(20,056)	(126,971)
Third-party capital lease arrangements to acquire property and equipment			2,007
Non-cash distribution of equity interest in AutoMatch USA, LLC, an indirect wholly-owned subsidiary of the Company			$ (38,838)
Non-cash distribution of a prepaid marketing deposit with Adams Outdoor Advertising Marketing Company				(1,000)
Non-cash distribution of receivable due to CWGS Holding, LLC				$ (883)
Par value of Class A common stock issued in exchange for common units in CWGS, LLC		130
Par value of Class A common stock issued for acquisition		$ 1