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Actuarial Assumptions Used to Determine Benefit Obligation and Net Periodic Service Cost (Detail) (W.E.T.)	12 Months Ended
	Dec. 31, 2012
W.E.T.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.41%
Expected long term rate of return on plan assets	3.80%

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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