Pension and Other Postretirement Benefits - Schedule of Changes in Projected Benefit Obligations (PBO) (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Pension Plan [Member]
Change in projected benefit obligations:
Plan amendments		$ 472
Special termination benefits	$ 3,694
Defined Benefit Pension Plan [Member] | U.S. [Member]
Change in projected benefit obligations:
PBO, beginning balance		233,790	$ 254,976
Service cost		633	1,225
Interest cost		9,018	8,473
Plan amendments		472	0
Special termination benefits		3,694	1,350
Plan curtailments		1,458	(1,726)
Foreign currency exchange rate changes		0	0
Actuarial losses (gains)		27,675	(17,062)
Participant contributions		0	0
Benefits paid from plan assets		(14,435)	(13,043)
Benefits paid by the Corporation		(403)	(403)
PBO, Ending balance		261,902	233,790
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Change in projected benefit obligations:
PBO, beginning balance		54,337	64,613
Service cost		444	477
Interest cost		1,399	1,391
Plan amendments		0	0
Special termination benefits		0	0
Plan curtailments		0	0
Foreign currency exchange rate changes		1,586	(3,434)
Actuarial losses (gains)		7,108	(5,762)
Participant contributions		0	0
Benefits paid from plan assets		(1,879)	(2,282)
Benefits paid by the Corporation		(656)	(666)
PBO, Ending balance		62,339	54,337
Other Postretirement Benefit Plans [Member]
Change in projected benefit obligations:
PBO, beginning balance		15,810	16,979
Service cost		286	457
Interest cost		390	494
Plan amendments		(4,632)	0
Special termination benefits	$ 478	(478)	126
Plan curtailments		0	0
Foreign currency exchange rate changes		0	0
Actuarial losses (gains)		1,250	(1,143)
Participant contributions		99	104
Benefits paid from plan assets		0	0
Benefits paid by the Corporation		(1,327)	(1,207)
PBO, Ending balance		$ 11,398	$ 15,810