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Schedule of Weighted Average Assumptions (Detail)	12 Months Ended
Schedule of Weighted Average Assumptions (Detail)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	4.24%	5.14%
Rate of increase in future compensation levels	5.00%	5.00%
Discount rate	5.14%	5.84%	5.90%
Rate of increase in future compensation levels	5.00%	5.00%	5.00%
Expected long-term rate of return on assets	7.25%	7.75%	7.75%
Postretirement Benefit
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.54%	4.44%
Discount rate	4.44%	5.57%	5.60%

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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