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Income per Common Share - Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income $ 417 $ 11,113 $ 7,066 $ 22,754
Total dividends on preferred stocks     (300) (300)
Numerator for basic net income per common share - net income applicable to common stock 417 11,113 6,766 22,454
Dividends on preferred stocks assumed to be converted, if dilutive     60 300
Numerator for diluted net income per common share $ 417 $ 11,113 $ 6,826 $ 22,754
Denominator:        
Denominator for basic net income per common share - weighted-average shares 22,747,925 22,544,857 22,711,332 22,538,773
Effect of dilutive securities:        
Convertible preferred stocks 916,666 916,666 583,333 916,666
Stock options 112,483 198,715 117,124 195,000
Dilutive potential common shares 1,029,149 1,115,381 700,457 1,111,666
Denominator for dilutive net income per common share - adjusted weighted-average shares and assumed conversions 23,777,074 23,660,238 23,411,789 23,650,439
Basic net income per common share $ 0.02 $ 0.49 $ 0.30 $ 1.00
Diluted net income per common share $ 0.02 $ 0.47 $ 0.29 $ 0.96
Series B Preferred Stock [Member]        
Numerator:        
Total dividends on preferred stocks     $ (240) $ (240)
Series D Preferred Stock [Member]        
Numerator:        
Total dividends on preferred stocks     $ (60) $ (60)