Employee Benefits - Sensitivity of Disclosures to Changes in Selected Assumptions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
25 BP Decrease in Discount Rate, Change in PBO	$ 19,983
25 BP Decrease in Discount Rate, Change in ABO	19,609
25 BP Decrease in Discount Rate, Change in pension expense	1,304
25 BP Decrease in Long-Term Rate of Return, Change in pension expense	1,043
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
25 BP Decrease in Discount Rate, Change in PBO	47,377
25 BP Decrease in Discount Rate, Change in ABO	45,329
25 BP Decrease in Discount Rate, Change in pension expense	2,783
25 BP Decrease in Long-Term Rate of Return, Change in pension expense	2,115
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
25 BP Decrease in Discount Rate, Change in ABO	3,745
25 BP Decrease in Discount Rate, Change in pension expense	$ 215