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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income | $ 11,333 | $ 7,371 | $ 24,413 | $ 54,771
Less: Income attributable to participating securities | (557) | (437) | (1,158) | (3,182)
Basic Earnings Per Share: |  |  |  |
Income allocated to common stockholders, Income (Numerator) | $ 10,776 | $ 6,934 | $ 23,255 | $ 51,589
Income allocated to common stockholders, Shares (Denominator) | 9,209 | 9,635 | 9,395 | 9,585
Income allocated to common stockholders, Per Share Amount | $ 1.17 | $ 0.72 | $ 2.48 | $ 5.38
Diluted Earnings Per Share: |  |  |  |
Income available to common stockholders and assumed conversions, Income (Numerator) | $ 11,804 | $ 8,066 | $ 26,461 | $ 54,952
Income available to common stockholders and assumed conversions, Shares (Denominator) | 10,718 | 11,371 | 10,964 | 11,347
Income available to common stockholders and assumed conversions, Per Share Amount | $ 1.10 | $ 0.71 | $ 2.41 | $ 4.84
Convertible Senior Notes [Member] |  |  |  |
Effect of Dilutive Securities: |  |  |  |
Dilutive Securities, Income (Numerator) | $ 1,028 | $ 1,132 | $ 3,206 | $ 3,363
Dilutive Securities, Shares (Denominator) | 1,447 | 1,651 | 1,507 | 1,650
Stock Options [Member] |  |  |  |
Effect of Dilutive Securities: |  |  |  |
Dilutive Securities, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Dilutive Securities, Shares (Denominator) | 62 | 85 | 62 | 112

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