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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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net income $ 37,343 $ 10,260 $ 7,427 $ (68) $ 11,560 $ 6,708 $ 26,033 $ 14,303 $ 54,962 $ 58,604 $ 83,842
Total dividends on preferred stocks                 (300) (300) (305)
Numerator for basic net income per common share - net income applicable to common stock 37,343 10,260 7,427 (368) 11,560 6,708 26,033 14,003 54,662 58,304 83,537
Dividends on preferred stocks assumed to be converted, if dilutive                 300 300 305
Interest expense including amortization of debt issuance costs, net of income taxes, on convertible debt assumed to be converted, if dilutive                       299
Numerator for diluted net income per common share                 54,962 58,604 84,141
Denominator:                      
Denominator for basic net income per common share - weighted-average shares                 22,465,176 22,359,967 21,962,294
Effect of dilutive securities:                      
Convertible preferred stocks                 916,666 917,006 935,432
Stock options                 215,124 261,596 325,752
Convertible notes payable                       275,764
Dilutive potential common shares                 1,131,790 1,178,602 1,536,948
Denominator for dilutive net income per common share - adjusted weighted-average shares and assumed conversions                 23,596,966 23,538,569 23,499,242
Basic net income per common share $ 1.66 $ 0.46 $ 0.33 $ (0.02) $ 0.52 $ 0.30 $ 1.17 $ 0.63 $ 2.43 $ 2.61 $ 3.80
Diluted net income per common share $ 1.58 $ 0.43 $ 0.31 $ (0.02) $ 0.49 $ 0.28 $ 1.11 $ 0.61 $ 2.33 $ 2.49 $ 3.58
Series B Preferred Stock [Member]
                      
Numerator:                      
Total dividends on preferred stocks                 (240) (240) (240)
Series D Preferred Stock [Member]
                      
Numerator:                      
Total dividends on preferred stocks                 (60) (60) (60)
Noncumulative Preferred Stock [Member]
                      
Numerator:                      
Total dividends on preferred stocks                       $ (5)