Restructuring Charges - Summary of Accrued Restructuring Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Accrued restructuring charge, beginning balance		$ 0	$ 5,679
Accretion expense			137
Restructuring reversals	$ 0	$ 0	(4,837)
Cash payments			(979)
Accrued restructuring charge, ending balance			$ 0