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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 Postemployment Benefits Weighted Average Assumptions [Line Items]
Discount rate	4.05%	4.40%
Rate of compensation increase	4.00%	4.00%
Discount rate	4.40%	5.54%	5.96%
Expected long-term rate at return on plan assets	8.00%	8.00%	8.00%
Rate of compensation increase	4.00%	4.00%	4.00%

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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