Income Taxes (Total Income Tax Expense (Benefit)) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Pretax (loss) income at federal statutory rate	$ (187,906)	$ (207,317)	$ 7,707
State income tax (benefit) expense, net federal (benefit) expense	(1,812)	(1,385)	992
Meals and entertainment	429	380	424
Change in state tax rates	(1,618)	1,605	(1,580)
Section 162 disallowance	538	110	562
Impairment charges on goodwill with no tax basis	163,630	153,371	0
Increase in valuation allowance	32	190	2,189
Other	553	7,206	(40)
Net income tax (benefit) expense	$ (26,154)	$ (45,840)	$ 10,254