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Employee Benefit Plans - Weighted-Average Assumptions Used To Determine Net Periodic Benefit Cost (Detail)	8 Months Ended
	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.96%
Rate of compensation increase	2.25%
Expected long-term rates of return	5.40%

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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