Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Amounts Recognized Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 13,765	$ 15,219	$ 14,974
Prior service cost	57	63	69
Amount recognized in AOCI	13,822	15,282	15,043
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	13,454	14,134	8,784
Prior service cost	0	0	0
Amount recognized in AOCI	$ 13,454	$ 14,134	$ 8,784