Total Provision For Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal, current	$ (500)	$ 2,200	$ (13,900)
State and local, current	(100)	500	(1,100)
Current income tax expense/(benefit)	(600)	2,700	(15,000)
Federal, deferred	22,100	(500)	21,000
State and local, deferred	2,400	(100)	1,600
Foreign, deferred	0	(100)	100
Deferred income taxes	24,500	(700)	22,700
Income tax expense	$ 23,935	$ 2,004	$ 7,671