Termination Benefits and Other Cost Reduction Actions - Summary of Company's Restructuring Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost And Reserve [Line Items]
Restructuring Reserve, Beginning Balance	$ 8,187
Net Costs	4,130	$ 2,755
Cash Payments	(4,503)
Restructuring Reserve, Ending Balance	7,814
Employee Severance and Related Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Reserve, Beginning Balance	4,245
Net Costs	2,745
Cash Payments	(3,115)
Restructuring Reserve, Ending Balance	3,875
Facilities-Related Charges [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring Reserve, Beginning Balance	3,942
Net Costs	1,385
Cash Payments	(1,388)
Restructuring Reserve, Ending Balance	$ 3,939