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Income Per Common Share - Computation of Basic and Diluted Net Income Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income $ 7,427 $ 26,033 $ 7,359 $ 40,336
Dividends on preferred stocks     (300) (300)
Net income applicable to common stock 7,427 26,033 7,059 40,036
Dividends on preferred stocks assumed to be converted, if dilutive     60 300
Numerator for diluted net income per common share 7,427 26,033 7,119 40,336
Denominator:        
Denominator for basic net income per common share-weighted-average shares 22,437,485 22,340,826 22,430,589 22,332,303
Effect of dilutive securities:        
Convertible preferred stocks 916,666 916,666 250,000 917,346
Stock options 223,232 251,838 234,071 266,776
Dilutive potential common shares 1,139,898 1,168,504 484,071 1,184,122
Denominator for diluted net income per common share-adjusted weighted-average shares and assumed conversions 23,577,383 23,509,330 22,914,660 23,516,425
Basic net income per common share $ 0.33 $ 1.17 $ 0.31 $ 1.79
Diluted net income per common share $ 0.31 $ 1.11 $ 0.31 $ 1.72
Series B Preferred Stock [Member]
        
Numerator:        
Dividends on preferred stocks     (240) (240)
Series D Preferred Stock [Member]
        
Numerator:        
Dividends on preferred stocks     $ (60) $ (60)