Restructuring and Severance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Restructuring And Related Activities [Abstract]
Restructuring and Severance Beginning Balance	$ 1,377
Restructuring expense incurred and changes in estimates	1,266	$ 3,098
Other cost reduction activities	81
Payments and non-cash item adjustment	(2,091)
Restructuring and Severance Ending Balance	$ 633	$ 1,377