Total Provision For Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal, current	$ 2,200	$ (13,900)	$ (2,000)
State and local, current	500	(1,100)	300
Current income tax expense/(benefit)	2,700	(15,000)	(1,700)
Federal, deferred	(500)	21,000	(43,200)
State and local, deferred	(100)	1,600	(13,900)
Foreign, deferred	(100)	100	0
Deferred income taxes	(700)	22,700	(57,100)
Income tax (expense) benefit	$ 2,004	$ 7,671	$ (58,773)