Postretirement Benefits Other Than Pensions - Schedule of Postretirement Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Funded status of the plans	$ 4,564
Foreign Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligations at beginning of year	21,981	$ 24,242
Service cost	397	495	$ 423
Interest cost	752	789	693
Actuarial loss (gain)	1,705	(1,130)
Benefits paid	(570)	(495)
Defined Benefit Plan, Benefit Obligation, Divestiture	(1,513)	0
Other	61	0
Foreign currency exchange rate effect	1,136	(1,920)
Benefit obligation at end of year	23,949	21,981	24,242
Funded status of the plans	(23,949)	(21,981)
Net amount recognized at December 31	(23,949)	(21,981)
UNITED STATES
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligations at beginning of year	25,633	34,824
Service cost	118	308	314
Interest cost	864	1,198	1,297
Actuarial loss (gain)	1,697	(9,227)
Benefits paid	(1,491)	(1,475)
Defined Benefit Plan, Benefit Obligation, Divestiture	(4,405)	0
Other	20	5
Foreign currency exchange rate effect	0	0
Benefit obligation at end of year	22,436	25,633	$ 34,824
Funded status of the plans	(22,436)	(25,633)
Net amount recognized at December 31	$ (22,436)	$ (25,633)