Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ (495)	$ 1,509	$ 11,310
State	(496)	120	500
Foreign	445	966	1,084
Total current	(546)	2,595	12,894
Deferred	(50,535)	(56,800)	24,389
Income taxes	$ (51,081)	$ (54,205)	$ 37,283