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Assumption of Health Care Cost Trend Rates (Detail)	12 Months Ended
Assumption of Health Care Cost Trend Rates (Detail)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Health Care Cost Trend Rate Assumed for Next Year	8.00%	8.00%
Rate that the Cost Trend Rate Gradually Declines to	4.50%	4.50%
Year that the Rate Reaches the Rate it is Assumed to Remain at	2019	2018

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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