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Schedule of Assumed Health Care Cost Trend Rate (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	8.00%	7.50%
Rate to which the cost trend rate gradually declines	5.00%	5.00%
Year the rate reaches the ultimate rate	2019	2017

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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