Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Amounts Recognized Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	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]
Net actuarial loss	$ 14,767	$ 13,765	$ 15,219
Prior service cost	51	57	63
Amount recognized in AOCI	14,818	13,822	15,282
Pension Plans | Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	12,972	13,454	14,134
Prior service cost	788	0	0
Amount recognized in AOCI	$ 13,760	$ 13,454	$ 14,134