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Net Income (Loss) Per Share - Summary of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | [1] | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ (2,930) |  | $ 792 | [1] |  | $ (28,018) | $ (7,349) |  |  |
Income from discontinued operations, net of tax | 135,825 |  | 3,663 | [1] |  | 146,579 | 12,564 |  |  |
Net income | $ 132,895 | $ 7,407 | $ 4,455 | [1] | $ (1,358) | $ 118,561 | $ 5,215 | $ 7,299 | $ (6,788) | $ 8,217
Weighted average shares outstanding | 27,544 |  | 27,159 | [1] |  | 27,403 | 26,973 |  |  |
Effect of dilutive stock options |  |  | 163 |  |  |  |  |  |  |
Diluted shares outstanding | 27,544 |  | 27,322 | [1] |  | 27,403 | 26,973 |  |  |
Basic income (loss) from continuing operations per share | $ (0.11) |  | $ 0.03 | [1] |  | $ (1.02) | $ (0.27) |  |  |
Basic income from discontinued operations per share | 4.93 |  | 0.13 | [1] |  | 5.35 | 0.47 |  |  |
Basic net income per share | 4.82 |  | 0.16 | [1] |  | 4.33 | 0.19 |  |  |
Diluted income (loss) from continuing operations per share | (0.11) |  | 0.03 | [1] |  | (1.02) | (0.27) |  |  |
Diluted income from discontinued operations per share | 4.93 |  | 0.13 | [1] |  | 5.35 | 0.47 |  |  |
Diluted net income per share | $ 4.82 |  | $ 0.16 | [1] |  | $ 4.33 | $ 0.19 |  |  |
[1] | Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)

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