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Assumption Used for Benefit Plans (Detail)	12 Months Ended
Assumption Used for Benefit Plans (Detail)	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits
Assumptions used to determine benefit obligations
Discount rate	4.19%	5.00%
Rate of compensation increase	2.49%	2.48%
Assumptions used to determine net expense
Discount rate	5.02%	5.39%
Expected return on plan assets	7.54%	7.55%
Rate of compensation increase	2.48%	2.49%
Other Postretirement Benefits
Assumptions used to determine benefit obligations
Discount rate	4.12%	4.91%
Assumptions used to determine net expense
Discount rate	4.92%	5.13%
Expected return on plan assets	4.00%	4.00%
Health care cost trend rate assumed for next year	6.75%	7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2020)	5.00%	5.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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- Definition

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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