Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefit Plans | U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 116	$ 126
Interest cost	1,664	1,810	1,878
Expected return on plan assets	(3,151)	(2,684)	(2,719)
Amortization of prior service cost	6	6	6
Recognized actuarial loss (gain)	263	21	308
Net periodic (benefit) cost	(1,218)	(731)	(401)
Pension Plans | Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	1,030	1,138	1,370
Expected return on plan assets	(1,210)	(1,196)	(1,520)
Amortization of prior service cost	0	0	0
Recognized actuarial loss (gain)	496	312	210
Net periodic (benefit) cost	$ 316	$ 254	$ 60