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Common Stock and Preferred Stock - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jun. 14, 2013
USD ($)
Mar. 15, 2013
USD ($)
Apr. 30, 2015
USD ($)
shares
Jan. 31, 2015
USD ($)
ExecutiveOfficers
Director
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Jan. 31, 2014
USD ($)
ExecutiveOfficers
Director
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
Class of Stock [Line Items]                    
Common stock, shares authorized             100,000,000 100,000,000    
Preferred shares, shares authorized             5,000,000 5,000,000    
Total number of shares authorized             105,000,000      
Common stock, par value | $ / shares             $ 0.001 $ 0.001    
Preferred shares, par value | $ / shares             $ 0.001 $ 0.001    
Common stock, shares issued             21,153,878 22,682,295    
Common stock, shares outstanding             21,153,878 22,682,295    
Dividends declared, per share | $ / shares                 $ 0.07  
Cash dividend paid | $ $ 1,500,000 $ 1,500,000         $ 0 $ 0 $ 3,084,000  
Number of executive officers | ExecutiveOfficers       2   2        
Number of non-employee directors | Director       5   5        
Common stock repurchased, shares         3,112,840          
Repurchase of common stock, average price per share | $ / shares         $ 7.71          
Common stock repurchased, value | $         $ 24,000,000     $ 24,000,000    
Securities                    
Class of Stock [Line Items]                    
Common stock repurchased, shares             1,547,361      
Common stock repurchased, value | $             $ 13,200,000      
Common stock retired and cancelled             1,000,000      
Debt instrument repurchase amount | $             $ 0      
Minimum | Restricted Stock                    
Class of Stock [Line Items]                    
Vesting period             1 year      
Maximum | Restricted Stock                    
Class of Stock [Line Items]                    
Vesting period             2 years      
Maximum | Securities                    
Class of Stock [Line Items]                    
Stock repurchase, authorized amount | $                   $ 30,000,000
Executive officer                    
Class of Stock [Line Items]                    
Restricted stock issued, shares     135,234 525,734   531,993        
Restricted stock issued, value | $     $ 900,000 $ 3,600,000   $ 3,600,000        
Executive officer | Minimum | Restricted Stock                    
Class of Stock [Line Items]                    
Vesting period     1 year 1 year   1 year        
Executive officer | Maximum | Restricted Stock                    
Class of Stock [Line Items]                    
Vesting period     3 years 3 years   3 years        
Non-employee directors                    
Class of Stock [Line Items]                    
Restricted stock issued, shares       73,855   78,150        
Restricted stock issued, value | $       $ 500,000   $ 500,000        
Non-employee directors | Restricted Stock                    
Class of Stock [Line Items]                    
Shares of restricted stock, vesting date       2016-01   2015-01