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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended 19 Months Ended
Apr. 30, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Jun. 30, 2016
Equity [Line Items]                      
Number of common stock, shares issued               584,000      
Total consideration for issuance of common stock               $ 10,000,000      
Treasury shares acquired             771,000 441,000 748,000    
Shares repurchased during period             $ 18,141,000 $ 8,510,000 $ 18,649,000    
Received distributions from the earnings of subsidiaries             122,200,000 46,900,000 58,200,000    
Capital contributions to subsidiaries             0   0    
APPCIC [Member]                      
Equity [Line Items]                      
Capital contributions to subsidiaries             $ 0 2,000,000 $ 0    
June 2016 Share Repurchase Program [Member]                      
Equity [Line Items]                      
Treasury shares acquired                   861,296  
Shares repurchased during period                   $ 20,000,000  
Stock Repurchase Program Expiration Date                   Dec. 31, 2017  
September 2017 Share Repurchase Program [Member]                      
Equity [Line Items]                      
Treasury shares acquired           8,192          
Shares repurchased during period           $ 200,000          
Stock Repurchase Program Expiration Date           Dec. 31, 2018          
Open Market [Member]                      
Equity [Line Items]                      
Treasury shares acquired             770,559        
Shares repurchased during period             $ 18,100,000        
Maximum [Member] | June 2016 Share Repurchase Program [Member]                      
Equity [Line Items]                      
Amount of shares authorized to repurchase                     $ 20,000,000
Maximum [Member] | September 2017 Share Repurchase Program [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                    
Total consideration for issuance of common stock $ 10,000,000                    
Cash proceeds from private placement 2,965,000                    
Amount of non-cash portion for cancellation of outstanding indebtedness, including accrued interest $ 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