Postretirement Benefits Other Than Pensions - Schedule of Net Periodic Benefit Costs for Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 397	$ 495	$ 423
Interest cost	752	789	693
Amortization of prior service credit and recognized actuarial gain (loss)	320	308	(15)
Other	48	0	0
Net periodic benefit cost (income)	1,517	1,592	1,101
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Service cost	118	308	314
Interest cost	864	1,198	1,297
Amortization of prior service credit and recognized actuarial gain (loss)	(2,441)	(1,672)	(1,915)
Other	0	5	5
Net periodic benefit cost (income)	$ (1,459)	$ (161)	$ (299)