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Postretirement Benefit Plans - Weighted Average Assumptions used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cost Assumptions:
Expected return on plan assets	8.00%	9.00%	9.00%
Others Benefits [Member]
Obligation Assumptions:
Discount rate	4.10%	4.80%
Cost Assumptions:
Discount rate	4.80%	5.50%
Expected return on plan assets	8.00%	9.00%

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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