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Net Periodic Pension Cost Assumptions (Detail)	12 Months Ended
Net Periodic Pension Cost Assumptions (Detail)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Average discount rate	3.50%	4.59%	5.06%
Expected long term rate of return on plan assets	4.75%	5.00%	6.00%
Rate of compensation increase		3.75%	3.75%

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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