Weighted Average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Ultimate Health Care Cost Year Five	4.50%	4.50%	4.50%
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.10%	4.80%
United States Pension Plans of US Entity, Defined Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.10%	4.80%
Foreign
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.30%	4.30%
Rate of compensation increase	3.40%	3.30%