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Reinsurance and Loss and Loss Adjustment Expenses - Additional Information (Detail) (USD $)
 5 Months Ended 9 Months Ended
Sep. 30, 2014
Reinsurer
Sep. 30, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Percentage of reinsurance   100.00%
Ceded rate of premiums under insurance program 100.00% 100.00%
Premiums written net   $ 315,563,000
The reinsurance recoverable 23,200,000 23,200,000
Number of reinsurers 3  
Reserve for losses and loss adjustment expense 0 0
Homeowners [Member]
    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Reinsurance recoverable, incurred but not reported claims 200,000 200,000
Private Passenger Auto Liability [Member]
    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Reinsurance recoverable, incurred but not reported claims 200,000 200,000
WNFIC [Member]
    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Ceded rate of premiums under insurance program 100.00% 100.00%
Expenses and allowance rate received in premiums 30.70% 30.70%
Premiums written net 315,100,000  
WNFIC [Member] | Quota Share Agreement [Member]
    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Effective cedes rate under quota share agreement 100.00% 100.00%
Commission rate, percent of ceded written premiums 30.50% 30.50%
WNFIC [Member] | Ceded Credit Risk, Concentrated Credit Risk [Member] | Quota Share Agreement [Member]
    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Ceded amount 500,000 500,000
Homeowners and Private Passenger [Member]
    
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Ceded rate of premiums under insurance program 100.00% 100.00%
Ceded unpaid loss 0 0
Ceded loss adjustment expenses   $ 300,000