Employee Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 12,627	$ 20,810
Prior service cost (credit)	(33,189)	(25,330)
Total AOCI (before tax effects)	(20,562)	(4,520)
U.S Plans [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	151,389	136,888
Prior service cost (credit)	151	194
Total AOCI (before tax effects)	151,540	137,082
Non-U.S. Plans [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	321,144	338,916
Prior service cost (credit)	(3,926)	(7,635)
Total AOCI (before tax effects)	$ 317,218	$ 331,281