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Common Stock and Preferred Stock - Additional Information (Detail)
 1 Months Ended 9 Months Ended
Apr. 30, 2015
USD ($)
shares
Jan. 31, 2015
USD ($)
ExecutiveOfficers
Director
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2014
$ / shares
shares
 [1]
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 repurchased, shares     3,112,840      
Repurchase of common stock, average price per share | $ / shares     $ 7.71      
Common stock repurchased, value | $     $ 24,000,000      
Number of executive officers | ExecutiveOfficers   2        
Number of non-employee directors | Director   5        
Securities            
Class of Stock [Line Items]            
Common stock repurchased, shares       774,033    
Common stock repurchased, value | $       $ 7,000,000    
Minimum | Restricted Stock            
Class of Stock [Line Items]            
Vesting period       1 year    
Maximum | Restricted Stock            
Class of Stock [Line Items]            
Vesting period       5 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        
Restricted stock issued, value | $ $ 900,000 $ 3,600,000        
Executive officer | Minimum | Restricted Stock            
Class of Stock [Line Items]            
Vesting period 1 year 1 year        
Executive officer | Maximum | Restricted Stock            
Class of Stock [Line Items]            
Vesting period 3 years 3 years        
Non-employee directors            
Class of Stock [Line Items]            
Restricted stock issued, shares   73,855        
Restricted stock issued, value | $   $ 500,000        
Non-employee directors | Restricted Stock            
Class of Stock [Line Items]            
Shares of restricted stock, vesting date   2016-01        
[1] Derived from audited financial statements