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Summary of Derivatives and Fair Values (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional Amount	$ 50,000
Strike	5.2175%
Trade Date	Oct. 01, 2008
Maturity Date	Oct. 01, 2013
Fair Value of Derivative Liabilities	$ (826)	$ (1,667)

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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