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Reinsurance - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fgl Reinsurance Agreement With Fsr [Member]
Dec. 31, 2012
Bankers Life Insurance Company [Member]
Dec. 31, 2013
Nomura [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]          
Document Period End Date Dec. 31, 2013        
Reserve financing facility         $ 295.0
Upfront structuring fee         2.8
LetterofCreditFutureQuarterlyReductiun         6.3
Reinsurance arrangment in percentage     10.00%    
Payments for reinsurance     1,400.0 153.0  
Contractholder funds $ 15,519.7 $ 15,248.2