Pension and Other Postretirement Benefits - Summary of Amounts Recognized in the Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Employee benefit obligations:
Employee benefit obligations	$ (83,936)	$ (72,658)
Defined Benefit Pension Plan [Member] | U.S. [Member]
Employee benefit obligations:
Prepaid pensions	0	0
Accrued payrolls and employee benefits	(464)	(436)
Employee benefit obligations	(65,771)	(50,813)
Total employee benefit obligations	(66,235)	(51,249)
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Employee benefit obligations:
Prepaid pensions	3,062	2,192
Accrued payrolls and employee benefits	0	0
Employee benefit obligations	(7,501)	(6,878)
Total employee benefit obligations	(4,439)	(4,686)
Other Postretirement Benefit Plans [Member]
Employee benefit obligations:
Prepaid pensions	0	0
Accrued payrolls and employee benefits	(1,305)	(1,395)
Employee benefit obligations	(10,093)	(14,415)
Total employee benefit obligations	$ (11,398)	$ (15,810)