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Assumed Health Care Cost Trend Rates (Detail)	12 Months Ended
Assumed Health Care Cost Trend Rates (Detail)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate assumed for following year	7.40%	7.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Year the cost trend rate reaches the ultimate trend rate	2027	2027

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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