Cash Flows - Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash paid during the year for:
Interest	$ 47,374	$ 50,705
Income taxes	25,660	1,354
Non-cash investing activities:
Derecognized property and equipment for leases that qualified as operating leases after completion of construction		(19,958)
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	1,605	530
Portion of acquisition purchase price paid through issuance of Class A common stock	5,720
Non-cash financing activities:
Derecognized right to use liabilities for leases that qualified as operating leases after completion of construction		(20,056)
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)
Par value of Class A common stock issued in exchange for common units in CWGS, LLC	66
Par value of Class A common stock issued for acquisition	$ 1