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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.