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Summary of Derivatives and Fair Values (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Derivative [Line Items] |  |  |  |
Notional Amount | $ 50,000 | [1] |  |
Strike | 5.2175% | [1] |  |
Trade Date | Oct. 01, 2008 | [1] |  |
Maturity Date | Oct. 01, 2013 | [1] |  |
Fair Value of Derivative Liabilities | $ (1,136) | [1] | $ (1,667) | [1]
[1] | Fair value excludes quarterly settlement payment due on Series F Agreement. As of September 30, 2012 and December 31, 2011, the outstanding payable was $326 and $280, respectively.

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