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Employee Benefits - Weighted Average Assumptions Used to Determine Net Pension and Other Postretirement Benefit Costs (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%	5.75%	6.00%
Rate of compensation increase	4.50%	4.50%	4.50%
Expected long term rate of return on plan assets	7.75%	7.75%	8.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%	5.75%	6.00%
Rate of compensation increase
Expected long term rate of return on plan assets	7.75%	7.75%	8.00%

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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