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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)