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Statutory Financial Information - Additional Information (Detail) (WNFIC [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended 9 Months Ended
May 20, 2014
Sep. 30, 2014
WNFIC [Member]
   
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus   $ 9.4
Statutory net Income   0.9
Issuance and payment of extraordinary dividend $ 7.0 $ 7.0