Income Taxes (Income Tax Expense (Benefit)) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax expense
State and local	$ 1,678	$ 2,422	$ 3,352
Total current income tax expense	1,678	2,422	3,352
Deferred tax (benefit) expense
Federal	(19,496)	(48,123)	7,172
State and local	(8,336)	(139)	(270)
Total deferred tax (benefit) expense	(27,832)	(48,262)	6,902
Net income tax (benefit) expense	$ (26,154)	$ (45,840)	$ 10,254