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Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Net income | $ 17,620 | $ 20,387
Less: Preferred stock dividends | 3 | (34)
Less: Income attributable to participating securities | (1,180) | (459)
Basic Earnings Per Share: |  |
Income allocated to common stockholders, Income (Numerator) | 16,443 | 19,894
Income allocated to common stockholders, Shares (Denominator) | 10,261 | 10,650
Income allocated to common stockholders, Per Share Amount | $ 1.60 | $ 1.87
Diluted Earnings Per Share: |  |
Income available to common stockholders and assumed conversions, Income (Numerator) | 17,511 | 19,928
Income available to common stockholders and assumed conversions, Shares (Denominator) | 12,138 | 11,031
Income available to common stockholders and assumed conversions, Per Share Amount | $ 1.44 | $ 1.81
Warrants [Member] |  |
Effect of Dilutive Securities: |  |
Dilutive Securities, Shares (Denominator) | 1,649 |
Convertible senior notes (Numerator) | 0 |
Convertible Preferred Stock [Member] |  |
Effect of Dilutive Securities: |  |
Dilutive Securities, Income (Numerator) |  |
Dilutive Securities, Shares (Denominator) | 1,071 |
Stock Options [Member] |  |
Effect of Dilutive Securities: |  |
Dilutive Securities, Shares (Denominator) | (3) | 34

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