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Income 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
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net income (loss) $ (68) $ 14,303
Total dividends on preferred stocks (300) (300)
Net income (loss) applicable to common stock (368) 14,003
Dividends on preferred stocks assumed to be converted, if dilutive    300
Numerator for diluted net income (loss) per common share (368) 14,303
Denominator:    
Denominator for basic net income (loss) per common share-weighted-average shares 22,424,000 22,324,000
Effect of dilutive securities:    
Convertible preferred stocks    918,026
Stock options    281,714
Dilutive potential common shares    1,199,740
Denominator for diluted net income (loss) per common share-adjusted weighted-average shares and assumed conversions 22,424,000 23,524,000
Basic net income (loss) per common share $ (0.02) $ 0.63
Diluted net income (loss) per common share $ (0.02) $ 0.61
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)