Weighted Average Actuarial Assumptions to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.70%	3.60%	4.90%
Discount rate	2.00%	3.70%
Rate of compensation increase	3.50%	3.50%
Health care cost trend rate:
Net periodic benefit cost rate of compensation increase	3.50%	3.50%	3.50%
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.90%	4.10%	4.60%
Discount rate	4.10%	4.90%
Expected return on plan assets	8.50%	8.50%	8.50%
Rate of compensation increase	3.00%	3.00%
Health care cost trend rate:
Assumed for next year	6.70%	7.20%
Ultimate rate	5.00%	4.90%
Year that the ultimate rate is reached	2058	2055
Net periodic benefit cost rate of compensation increase	3.00%	3.10%	3.10%