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Long-Term Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 28, 2016
Mar. 29, 2013
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 23, 2013
Nov. 09, 2006
Debt Instrument [Line Items]                
Statutory capital and surplus       $ 14,300,000        
Principal repayments of Surplus Note       1,500,000 $ 1,500,000 $ 1,500,000    
Surplus during the term of surplus note       50,000,000        
Issuance of common stock       10,000,000        
Amortization of discount       149,000 521,000 840,000    
Interest Expense       $ 400,000 $ 1,000,000 $ 1,500,000    
Deutsche Bank [Member]                
Debt Instrument [Line Items]                
Unsecured line of credit, maximum borrowing capacity   $ 15,000,000            
DB loan, maturity date   Jul. 31, 2017            
DB loan, Interest rate       LIBOR plus a margin of 5.50% or Deutsche Bank’s prime rate plus a margin of 3.50%        
Basis spread on LIBOR rate   5.50%            
Basis spread on Prime rate   3.50%            
Unsecured line of credit, amount drawn       $ 0        
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member]                
Debt Instrument [Line Items]                
Number of common stock, shares issued 583,771              
Common stock, price per share $ 17.13   $ 17.13          
Issuance of common stock $ 10,000,000   $ 10,000,000          
Cash proceeds from private placement 2,965,000   2,965,000          
Proceeds used to cancellation of outstanding indebtedness, including accrued interest $ 7,035,000   $ 7,035,000          
Surplus Note [Member]                
Debt Instrument [Line Items]                
Unsecured term loan agreement               $ 25,000,000
Effective interest rate       1.88% 2.21% 2.73%    
Principal repayments of Surplus Note       $ 368,000        
Maturity year of debt instrument       through 2026        
Net written premium to surplus ratio       200.00%        
Gross written premium to surplus ratio       600.00%        
Surplus Note [Member] | Hurricane [Member]                
Debt Instrument [Line Items]                
Surplus and Reinsurance sufficient to cover in excess of UPCIC probable maximum loss       1-in-100 year        
Term Loan [Member]                
Debt Instrument [Line Items]                
Unsecured term loan agreement         $ 7,000,000   $ 20,000,000  
Effective interest rate       5.99%        
Surplus note maturity date       May 23, 2016        
Stated interest rate on Term Loan       0.50%        
Frequency of periodic payment description       Principal was paid annually on the anniversary of the closing date in three annual installments and interest was payable in arrears on the same dates as the principal payments.        
Term Loan is amortized       3 years        
Amortization of discount       $ 149,000 $ 521,000 $ 840,000