Restructuring Program and Separation Costs - Schedule of Restructuring Program Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost And Reserve [Line Items]
Costs incurred	$ 267	$ 11,567
Severance and Other Employment Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Liability as of December 31, 2014	7,691
Costs incurred	267
Payments made	$ (7,958)
Liability as of December 31, 2015		$ 7,691