Income Taxes Changes in Balance of Deferred Tax Asset Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Asset Valuation Allowance [Roll Forward]
Beginning Balance	$ (30,768)	$ (33,757)	$ (49,562)
Additions	(61,122)	(1,895)	(4,359)
Deductions	6,520	4,884	20,164
Ending Balance	$ (85,370)	$ (30,768)	$ (33,757)