Employee Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 178,677	$ 145,105
Prior service cost (credit)	387	482
Total AOCI (before tax effects)	179,064	145,587
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	360,070	263,930
Prior service cost (credit)	(10,697)	(1,330)
Total AOCI (before tax effects)	349,373	262,600
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	21,057	13,891
Prior service cost (credit)	(10,358)	(15,007)
Total AOCI (before tax effects)	$ 10,699	$ (1,116)