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Income (Loss) Per Common Share - Computation of Basic and Diluted Net Income (Loss) Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Net income (loss) $ (3,777) $ 10,260 $ 18,977 $ 17,619
Total dividends on preferred stocks     (300) (300)
Numerator for basic net income (loss) per common share - net income (loss) applicable to common stock (3,777) 10,260 18,677 17,319
Dividends on preferred stocks assumed to be converted, if dilutive     300 300
Numerator for diluted net income (loss) per common share (3,777) 10,260 18,977 17,619
Denominator:        
Denominator for basic net income (loss) per common share - weighted-average shares 22,595,634 22,477,974 22,557,935 22,446,557
Effect of dilutive securities:        
Convertible preferred stocks   916,666 916,666 916,666
Stock options   202,645 187,026 223,352
Dilutive potential common shares   1,119,311 1,103,692 1,140,018
Denominator for diluted net income (loss) per common share - adjusted weighted-average shares and assumed conversions 22,595,634 23,597,285 23,661,627 23,586,575
Basic net income (loss) per common share $ (0.17) $ 0.46 $ 0.83 $ 0.77
Diluted net income (loss) per common share $ (0.17) $ 0.43 $ 0.80 $ 0.75
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)