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Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income | $ 22,022 | $ 16,430 | $ 47,400 | $ 34,050
Less: Preferred stock dividends |  | 1 |  | 4
Less: Income attributable to participating securities | (1,231) | (1,203) | (2,730) | (2,386)
Basic Earnings Per Share: |  |  |  |
Income allocated to common stockholders, Income (Numerator) | $ 20,791 | $ 15,228 | $ 44,670 | $ 31,668
Income allocated to common stockholders, Shares (Denominator) | 9,580 | 9,925 | 9,560 | 10,092
Income allocated to common stockholders, Per Share Amount | $ 2.17 | $ 1.53 | $ 4.67 | $ 3.14
Diluted Earnings Per Share: |  |  |  |
Income available to common stockholders and assumed conversions, Income (Numerator) | $ 21,912 | $ 16,308 | $ 46,901 | $ 33,816
Income available to common stockholders and assumed conversions, Shares (Denominator) | 11,345 | 11,710 | 11,334 | 11,923
Income available to common stockholders and assumed conversions, Per Share Amount | $ 1.93 | $ 1.39 | $ 4.14 | $ 2.84
Convertible Senior Notes [Member] |  |  |  |
Effect of Dilutive Securities: |  |  |  |
Dilutive Securities, Income (Numerator) | $ 1,121 | $ 1,081 | $ 2,231 | $ 2,152
Dilutive Securities, Shares (Denominator) | 1,650 | 1,649 | 1,649 | 1,649
Convertible Preferred Stock [Member] |  |  |  |
Effect of Dilutive Securities: |  |  |  |
Dilutive Securities, Income (Numerator) |  | $ (1) |  | $ (4)
Dilutive Securities, Shares (Denominator) |  | 3 |  | 41
Stock Options [Member] |  |  |  |
Effect of Dilutive Securities: |  |  |  |
Dilutive Securities, Shares (Denominator) | 115 | 133 | 125 | 141

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