Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Acquisition and debt related costs	$ 18,281	$ 20,319
Net operating loss	283,947	269,002
Self-insurance	10,039	9,666
Deferred revenue	942	1,021
Cash flow hedge	6,401	286
Tax credits	4,546	2,920
Other	9,652	7,483
Total deferred income tax assets	333,808	310,697
Valuation allowance	(1,466)	(1,507)
Net deferred tax assets	332,342	309,190
Deferred income tax liabilities:
Property and equipment	(309,054)	(278,851)
Goodwill	(42,458)	(35,396)
Amortization	(17,564)	(15,226)
Other	(4,961)	(4,209)
Total deferred income tax liabilities	(374,037)	(333,682)
Net deferred income tax liabilities	$ (41,695)	$ (24,492)