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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
Dec. 31, 2018
Apr. 30, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2016
Equity [Line Items]                          
Series A preferred stock pays a cumulative dividend               $ 1.00 $ 1.00 $ 1.00      
Shares reissued                   584,000      
Total consideration for issuance of common stock                   $ 10,000,000      
Treasury shares acquired               688,000 771,000 441,000      
Shares repurchased during period               $ 25,276,000 $ 18,141,000 $ 8,510,000      
Received distributions from the earnings of subsidiaries               96,600,000 122,200,000 46,900,000      
Capital contributions to subsidiaries               0 0        
APPCIC                          
Equity [Line Items]                          
Capital contributions to subsidiaries               $ 0 0 $ 2,000,000.0      
June 2016 Share Repurchase Program                          
Equity [Line Items]                          
Amount of shares authorized to repurchase                         $ 20,000,000
Stock repurchase program expiration date                     Dec. 31, 2017    
Treasury shares acquired                     861,296    
Shares repurchased during period                     $ 20,000,000.0    
September 2017 Share Repurchase Program                          
Equity [Line Items]                          
Stock repurchase program expiration date             Dec. 31, 2018            
Treasury shares acquired             558,647            
Shares repurchased during period             $ 20,000,000.0            
December 2018 Share Repurchase Program                          
Equity [Line Items]                          
Treasury shares acquired 138,234                        
Shares repurchased during period $ 5,500,000                        
Open Market                          
Equity [Line Items]                          
Treasury shares acquired               688,689          
Shares repurchased during period               $ 25,300,000          
Maximum | September 2017 Share Repurchase Program                          
Equity [Line Items]                          
Amount of shares authorized to repurchase                       $ 20,000,000  
Maximum | December 2018 Share Repurchase Program                          
Equity [Line Items]                          
Amount of shares authorized to repurchase $ 20,000,000   $ 20,000,000         20,000,000          
Private Placement | RenaissanceRe Ventures Ltd                          
Equity [Line Items]                          
Shares reissued   583,771                      
Common stock, price per share (in dollars 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   $ 7,035,000.000                      
Series A                          
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