Termination Benefits and Other Cost Reduction Actions - Summary of Company's Restructuring Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			$ 12,243
Net Costs	$ 4,718	$ 2,099	11,173	$ 12,744
Cash Payments			(15,137)
Restructuring Reserve, Ending Balance	8,279		8,279
Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			5,145
Net Costs			10,241
Cash Payments			(10,291)
Restructuring Reserve, Ending Balance	5,095		5,095
Facilities-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			7,098
Net Costs			932
Cash Payments			(4,846)
Restructuring Reserve, Ending Balance	$ 3,184		$ 3,184