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Common Stock, Preferred Stock and Warrants - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Oct. 31, 2016
shares
Mar. 31, 2016
USD ($)
shares
Jan. 31, 2016
USD ($)
ExecutiveOfficers
Director
shares
Apr. 30, 2015
USD ($)
shares
Jan. 31, 2015
USD ($)
ExecutiveOfficers
Director
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Jan. 31, 2014
USD ($)
ExecutiveOfficers
Director
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Class of Stock [Line Items]                      
Common stock, shares authorized | shares               100,000,000 100,000,000    
Preferred shares, shares authorized | shares               5,000,000 5,000,000    
Total number of shares authorized | shares               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 | shares               19,376,773 21,153,878    
Common stock, shares outstanding | shares               19,376,773 21,153,878    
Number of executive officers | ExecutiveOfficers         2   2        
Number of non-employee directors | Director         5   5        
Repurchase of common stock, shares | shares           3,112,840          
Repurchase of common stock, average price per share | $ / shares           $ 7.71          
Repurchase of common stock, value           $ 24,000,000       $ 24,000,000  
Repurchase of convertible senior notes               $ 8,035,000   $ 39,000,000  
Cash dividend paid               0 $ 0    
4.875% Convertible Senior Notes (due 2020)                      
Class of Stock [Line Items]                      
Amount of convertible notes repurchased and retired     $ 2,000,000                
4.25% Convertible Senior Notes (due 2018)                      
Class of Stock [Line Items]                      
Amount of convertible notes repurchased and retired               $ 6,100,000      
Securities                      
Class of Stock [Line Items]                      
Retirement of common stock (share) | shares               1,766,284 1,547,361    
Retirement of common stock               $ 13,500,000 $ 13,200,000    
Securities | 4.875% Convertible Senior Notes (due 2020)                      
Class of Stock [Line Items]                      
Amount of convertible notes repurchased and retired               2,000,000      
Repurchase of convertible senior notes               1,900,000      
Securities | 4.25% Convertible Senior Notes (due 2018)                      
Class of Stock [Line Items]                      
Amount of convertible notes repurchased and retired               6,100,000      
Repurchase of convertible senior notes               $ 6,100,000      
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                     $ 35,000,000
Executive officer                      
Class of Stock [Line Items]                      
Restricted stock issued, shares | shares   134,058 449,120 135,234 525,734   531,993        
Restricted stock issued, value   $ 900,000 $ 3,600,000 $ 900,000 $ 3,600,000   $ 3,600,000        
Number of executive officers | ExecutiveOfficers     2                
Executive officer | Restricted Stock                      
Class of Stock [Line Items]                      
Vesting period   3 years 3 years 3 years 3 years            
Executive officer | Minimum | Restricted Stock                      
Class of Stock [Line Items]                      
Vesting period             1 year        
Executive officer | Maximum | Restricted Stock                      
Class of Stock [Line Items]                      
Vesting period             3 years        
Non-employee directors                      
Class of Stock [Line Items]                      
Restricted stock issued, shares | shares 2,463   62,710   73,855   78,150        
Restricted stock issued, value     $ 500,000   $ 500,000   $ 500,000        
Number of non-employee directors | Director     5                
Non-employee directors | Restricted Stock                      
Class of Stock [Line Items]                      
Shares of restricted stock, vesting date 2017-01   2017-01   2016-01   2015-01