Income Taxes - Summary of Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Depreciation	$ 103,471	$ 100,607
Other	3,482	(559)
Gross deferred tax liabilities	106,953	100,048
Allowance for doubtful accounts	(1,350)	(1,511)
Equity-based compensation	(3,961)	(3,440)
Employee benefits	(4,847)	(7,024)
Claims and insurance	(20,942)	(22,019)
Other	(8,436)	(7,108)
Gross deferred tax assets	(39,536)	(41,102)
Net deferred tax liability	$ 67,417	$ 58,946