Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligation (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure
Actuarial (gain) loss	$ 7,700	$ (3,500)
Ending Balance	168,500		$ 168,500
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year			178,237	$ 363,026
Service cost			1,608	2,196	$ 2,239
Interest cost			7,189	8,940	13,151
Actuarial (gain) loss			24,447	(30,136)
Benefits paid			(7,690)	(14,793)
Retiree annuity purchase				(151,341)
Liability loss due to settlement				345
Projected benefit obligation, End of year	203,791	178,237	203,791	178,237	363,026
Beginning Balance			144,301	324,506
Company contributions			2,805	2,587
Actual return on plan assets			27,516	(16,658)
Benefits paid			(7,690)	(14,793)
Retiree annuity purchase				(151,341)
Ending Balance	166,932	144,301	166,932	144,301	324,506
Funded status	(36,859)	(33,936)	(36,859)	(33,936)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year			39,146	39,353
Service cost			751	786	818
Interest cost			691	687	852
Actuarial (gain) loss			4,520	773
Benefits paid			(836)	(741)
Non-U.S. currency movement			(320)	(1,712)
Projected benefit obligation, End of year	43,952	39,146	43,952	39,146	39,353
Beginning Balance			1,400	1,307
Company contributions			923	822
Actual return on plan assets			64	50
Benefits paid			(836)	(741)
Non-U.S. currency movement			35	(38)
Ending Balance	1,586	1,400	1,586	1,400	1,307
Funded status	(42,366)	(37,746)	(42,366)	(37,746)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year			9,256	6,177
Service cost			41	39	34
Interest cost			347	196	201
Actuarial (gain) loss			717	25
Benefits paid			(1,358)	(889)
Special termination benefits				3,708	591
Projected benefit obligation, End of year	9,003	9,256	9,003	9,256	$ 6,177
Company contributions			1,358	889
Benefits paid			(1,358)	(889)
Funded status	$ (9,003)	$ (9,256)	$ (9,003)	$ (9,256)