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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
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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)

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