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Derivative Financial Instruments - Carrying Value of Derivative Instruments of FGL Including Derivative Instruments Embedded in FIA Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Derivatives, Fair Value [Line Items]    
Derivative investments:      
Total assets derivative 200,667 52,335
Liabilities:    
Total liabilities derivative 1,551,733 1,400,568
Call options [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets derivative 200,667 52,335
FIA embedded derivative [Member]
   
Liabilities:    
Total liabilities derivative 1,550,805 1,396,340
Futures contracts [Member]
   
Liabilities:    
Total liabilities derivative 928 3,828
Available-for-sale embedded derivatives [Member]
   
Liabilities:    
Total liabilities derivative   $ 400