Weighted Average Actuarial Assumptions to Determine Benefit Obligations (Detail) (Domestic Pension and Other Postretirement Benefit Plans)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Domestic Pension and Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.90%	4.10%
Expected return on plan assets	8.50%	8.50%	8.50%
Rate of compensation increase	3.00%	3.10%
Health care cost trend rate:
Assumed for next year	7.20%	7.20%
Ultimate rate	4.90%	4.50%
Year that the ultimate rate is reached	2055	2046