Pensions - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Settlements	$ 15,819	$ 775	$ 6,427
UNITED STATES
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	118	308	314
Interest cost	864	1,198	1,297
Settlements	(3,452)
Other	0	5	5
Net periodic benefit cost (income)	(1,459)	(161)	(299)
Foreign Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	397	495	423
Interest cost	752	789	693
Settlements	453
Other	48	0	0
Net periodic benefit cost (income)	1,517	1,592	1,101
Pension Plan [Member] | UNITED STATES
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	809	852	814
Interest cost	10,955	10,824	11,700
Expected return on plan assets	(16,353)	(17,414)	(16,012)
Amortization of prior service cost and actuarial loss	2,914	2,403	1,871
Settlements	15,247	0	0
Other	0	0	0
Net periodic benefit cost (income)	13,572	(3,335)	(1,627)
Pension Plan [Member] | Foreign Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	3,893	4,383	4,025
Interest cost	4,037	4,207	4,341
Expected return on plan assets	(2,400)	(2,178)	(2,617)
Amortization of prior service cost and actuarial loss	2,373	2,646	2,898
Settlements	572	775	6,427
Other	956	0	0
Net periodic benefit cost (income)	$ 9,431	$ 9,833	$ 15,074