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Benefit Plans - Weighted Average Discount Rate (Detail)	12 Months Ended
Benefit Plans - Weighted Average Discount Rate (Detail)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.87%	5.75%	6.00%
Expected long-term return on plan assets	7.50%	8.00%	8.00%
Rate of compensation increase	2.75%	3.25%	3.50%

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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