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Summary of Significant Assumptions (Detail)	12 Months Ended
Summary of Significant Assumptions (Detail)	Dec. 31, 2012	Dec. 31, 2011
Weighted-average assumptions used to determine benefit obligation:
Discount rate	3.61%	4.40%
Rate of compensation increase	3.00%	3.00%
Weighted-average assumptions used to determine benefit cost:
Discount rate	4.40%	5.54%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase	3.00%	3.00%

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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