Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 1,509	$ 11,310	$ 27,188
State	120	500	2,164
Foreign	966	1,084	842
Total current	2,595	12,894	30,194
Deferred	(56,800)	24,389	10,121
Income taxes	$ (54,205)	$ 37,283	$ 40,315