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Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Discounted Cash Flow [Member]
Unobservable Inputs (Level 3) [Member]
Series F Agreement [Member]
Minimum [Member]
Sep. 30, 2012
Discounted Cash Flow [Member]
Unobservable Inputs (Level 3) [Member]
Series F Agreement [Member]
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair value inputs, long dated treasuries     2.77% [1] 2.94% [1]
Fair value inputs, own credit risk     1.04% [2] 1.82% [2]
Fair Value at September 30, 2012 $ (1,136) $ (1,667)    
[1] Represents the forward 30 year Treasury CMT Rate.
[2] Represents credit default swap spread curve used in the valuation analysis.