Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Change in Benefit Obligation Plan Assets and Funded Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in plan assets:
Fair value of plan assets — Beginning of the year	$ 80,423
Fair value of plan assets at end of the year	73,386	$ 80,423
Other Postretirement Benefit Plans | U.S. Pension and Other Post-Retirement Benefit Plans
Change in benefit obligation:
Benefit obligation — Beginning of the year	50,072	47,512
Service cost	0	116
Interest cost	1,664	1,810	$ 1,878
Participant contributions	9	8
Benefits paid	(2,360)	(2,188)
Actuarial (gain) loss	(4,147)	2,814
Exchange rate changes	0	0
Benefit obligation at end of the year	45,238	50,072	47,512
Change in plan assets:
Fair value of plan assets — Beginning of the year	45,046	38,390
Actual return on plan assets	(2,259)	6,584
Employer contributions	2,526	2,252
Participant contributions	9	8
Benefits paid	(2,360)	(2,188)
Exchange rate changes	0	0
Fair value of plan assets at end of the year	42,962	45,046	38,390
Funded status	(2,276)	(5,026)
Pension Plans | Non-U.S. Pension Plans
Change in benefit obligation:
Benefit obligation — Beginning of the year	45,737	40,820
Service cost	788	0
Interest cost	1,030	1,138	1,370
Participant contributions	0	0
Benefits paid	(1,816)	(1,309)
Actuarial (gain) loss	(2,772)	1,099
Exchange rate changes	(2,702)	3,989
Benefit obligation at end of the year	40,265	45,737	40,820
Change in plan assets:
Fair value of plan assets — Beginning of the year	35,377	31,080
Actual return on plan assets	(1,808)	1,798
Employer contributions	763	747
Participant contributions	0	0
Benefits paid	(1,816)	(1,309)
Exchange rate changes	(2,092)	3,061
Fair value of plan assets at end of the year	30,424	35,377	$ 31,080
Funded status	$ (9,841)	$ (10,360)