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Derivative Financial Instruments - Summary of Change in Fair Value of Derivative Instruments of FGL Included in Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Net investment gains (losses):    
Derivative instruments, Net investment gains (losses) $ 146,052 $ (170,752)
Net investment income:    
Total 146,452 (170,733)
Call options [Member]
    
Net investment gains (losses):    
Derivative instruments, Net investment gains (losses) 100,030 (142,665)
Futures contracts [Member]
    
Net investment gains (losses):    
Derivative instruments, Net investment gains (losses) 46,022 (28,087)
Available-for-sale embedded derivatives [Member]
    
Net investment income:    
Derivative instruments, Net investment income 400 19
FIA embedded derivative [Member]
    
Benefits and other changes in policy reserves:    
FIA embedded derivatives $ 154,465 $ (69,968)