Pension and Postretirement Benefits other than Pensions - Net Periodic Benefit Cost of Defined Benefit Plans and Other Postretirement Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Foreign Plan [Member] | Pension Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 989	$ 1,111
Interest cost	782	1,060
Expected return on plan assets	(577)	(595)
Amortization of prior service cost credit and recognized actuarial gain (loss)	794	616
Net periodic benefit (income) cost	1,988	2,192
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	96	117
Interest cost	173	203
Amortization of prior service cost credit and recognized actuarial gain (loss)	107	38
Net periodic benefit (income) cost	376	358
UNITED STATES | Pension Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	213	189
Interest cost	2,033	2,952
Expected return on plan assets	(3,421)	(4,155)
Amortization of prior service cost credit and recognized actuarial gain (loss)	485	781
Net periodic benefit (income) cost	(690)	(233)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	26	41
Interest cost	170	259
Amortization of prior service cost credit and recognized actuarial gain (loss)	(483)	742
Net periodic benefit (income) cost	$ (287)	$ (442)