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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Insurance [Abstract]      
Homeowner's property maximum settlement time 1 year    
Initial case reserve for claims $ 2,500    
LAE case reserves 0    
Change in reserve for claims due to re-estimates $ 4,700,000 $ 300,000 $ 700,000