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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended
Apr. 28, 2016
Apr. 30, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Line Items]                    
Issuance of common stock               $ 10,000,000    
Treasury shares acquired             98,929      
Shares repurchased during period             $ 2,100,000 8,510,000 $ 18,649,000 $ 29,736,000
Stock Repurchase Program Expiration Date             Dec. 31, 2017      
Received distributions from the earnings of subsidiaries               46,900,000 58,200,000 55,800,000
Capital contributions to subsidiaries                 0 $ 0
APPCIC [Member]                    
Equity [Line Items]                    
Capital contributions to subsidiaries               $ 2,000,000    
Open Market [Member]                    
Equity [Line Items]                    
Treasury shares acquired               441,036    
Shares repurchased during period               $ 8,500,000    
Maximum [Member]                    
Equity [Line Items]                    
Amount of shares authorized to repurchase         $ 20,000,000          
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member]                    
Equity [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                
Series A [Member]                    
Equity [Line Items]                    
Series A preferred stock pays a cumulative dividend     $ 0.25 $ 0.25 $ 0.25 $ 0.25        
Preferred stock aggregate dividends               $ 10,000 $ 10,000