Restructuring and Other Charges, Net - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) employee	Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 927	$ 3,249	$ 2,830	$ 14,183
2017 Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			$ 23,400
Number of positions expected to be eliminated | employee			370
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge	900		$ 2,800
Employee Severance [Member] | 2017 Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			6,400
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge		$ 3,200		$ 14,200
Minimum | 2017 Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	30,000		30,000
Minimum | Employee Severance [Member] | 2017 Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	24,000		24,000
Minimum | Facility-Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	6,000		6,000
Maximum | 2017 Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	35,000		35,000
Maximum | Employee Severance [Member] | 2017 Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 26,000		$ 26,000