Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets:
Acquisition and debt related costs	$ 5,814	$ 5,557
Net operating losses	180,658	201,604
Goodwill impairment	53,972	54,207
Self-insurance	6,847	6,992
Deferred revenue	2,718	2,627
Cash flow hedge		2,282
Restricted stock	4,472	4,097
Tax credits	9,317	7,922
Other	7,779	7,263
Total deferred income tax assets	271,577	292,551
Valuation allowance	(2,762)	(2,762)
Net deferred tax assets	268,815	289,789
Deferred income tax liabilities:
Property and equipment	(192,224)	(201,019)
Amortization - Goodwill	(41,803)	(37,291)
Amortization - Other Intangibles	(18,144)	(15,193)
Cash flow hedge	(836)
Other	(2,992)	(3,466)
Total deferred income tax liabilities	(255,999)	(256,969)
Net deferred income tax assets	$ 12,816	$ 32,820