Income Taxes - Summary of Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Depreciation	$ 86,506	$ 117,625
Other	93	1,414
Gross deferred tax liabilities	86,599	119,039
Allowance for doubtful accounts	(988)	(1,225)
Equity-based compensation	(2,607)	(4,538)
Employee benefits	(5,458)	(6,115)
Claims and insurance	(16,929)	(23,241)
Other	(1,194)	(3,721)
Gross deferred tax assets	(27,176)	(38,840)
Net deferred tax liability	$ 59,423	$ 80,199