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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 13, 2016
Jan. 14, 2016
Jun. 30, 2016
Apr. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Nov. 30, 2015
Equity [Line Items]                    
Amount of shares authorized to repurchase     $ 20,000,000   $ 20,000,000   $ 20,000,000     $ 10,000,000
Treasury shares acquired     25,000       342,107      
Shares repurchased during period     $ 486,000       $ 6,400,000      
Common stock, par value     $ 0.01   $ 0.01   $ 0.01   $ 0.01  
Issuance of common stock               $ 504,000    
Dividends per share declared on outstanding common stock $ 0.14 $ 0.14     $ 0.14 $ 0.12 $ 0.28 $ 0.24    
Installment1-FY2016                    
Equity [Line Items]                    
Dividends payable date             Mar. 02, 2016      
Dividends payable, shareholders record date             Feb. 18, 2016      
Installment2-FY2016                    
Equity [Line Items]                    
Dividends payable date             Jul. 05, 2016      
Dividends payable, shareholders record date             Jun. 15, 2016      
Private Placement [Member] | RenaissanceRe Ventures Ltd [Member]                    
Equity [Line Items]                    
Number of common stock, shares issued       583,771            
Common stock, par value       $ 17.13            
Issuance of common stock       $ 10,000,000            
Cash proceeds from private placement       2,965,000            
Proceeds used to cancellation of outstanding indebtedness       $ 7,035,000