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Reinsurance - Additional Information (Detail) (Stockholders' Equity, Total [Member], Amounts Due From Reinsurers [Member])
3 Months Ended
Mar. 31, 2014
Stockholders' Equity, Total [Member] | Amounts Due From Reinsurers [Member]
 
Effects of Reinsurance [Line Items]  
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity 3.00%