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Reinsurance - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended
Jun. 30, 2012
Dec. 30, 2012
Oct. 17, 2011
Apr. 08, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Fair value of insurance transferred assets     $ 580.7 $ 535.8
Pre-tax gain on reinsurance transactions deferred   18.0    
FGL cedes fund on withheld basis 10.00%      
Nomura [Member]
        
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Reserve financing facility   295.0    
Upfront structuring fee   $ 2.8