Termination Benefits and Other Cost Reduction Actions - Summary of Real Estate Consolidations, Elimination of Redundant Functions and Employees Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring and Related Activities [Abstract]
Employee severance and related costs	$ 4,117	$ 1,976	$ 10,241	$ 8,947
Facilities-related costs	601	123	932	3,797
Total	$ 4,718	$ 2,099	$ 11,173	$ 12,744