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Prior Periods Financial Statement Revision - Schedule of Revision on Condensed Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ 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 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Changes And Error Corrections [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expense | $ 16,985 |  | $ 14,201 | [1] |  | $ 52,606 | $ 46,931 | [1] |  |  |
Income (loss) from operations | 6,296 |  | 12,985 | [1] |  | 32,294 | 29,457 | [1] |  |  |
Write-off of unamortized debt issuance costs |  |  |  |  |  | 8,054 | 2,589 |  |  |  |
Interest expense | 12,739 |  | 15,801 | [1] |  | 39,916 | 48,708 | [1] |  |  |
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture | (5,568) |  | (8,881) | [1] |  | (46,302) | (23,282) | [1] |  |  |
Provision (benefit) for income taxes | (1,436) |  | (8,246) | [1] |  | (14,145) | (11,763) | [1] |  |  |
Net income (loss) | $ 132,895 | $ 7,407 | $ 4,455 | [1] | $ (1,358) | $ 118,561 | $ 5,215 | [1] | $ 7,299 | $ (6,788) | $ 8,217
Basic net income (loss) per share | $ 4.82 |  | $ 0.16 | [1] |  | $ 4.33 | $ 0.19 | [1] |  |  |
Diluted net income (loss) per share | $ 4.82 |  | $ 0.16 | [1] |  | $ 4.33 | $ 0.19 | [1] |  |  |
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expense |  |  | $ 18,347 |  | 20,712 |  | $ 60,651 |  | 80,266 | 51,745 |
Income (loss) from operations |  |  | 18,727 |  | 11,874 |  | 47,304 |  | 59,400 | 26,797 |
Write-off of unamortized debt issuance costs |  |  |  |  |  |  |  |  | 3,089 | 18,673 |
Interest expense |  |  | 16,337 |  |  |  | 48,924 |  |  |  |
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture |  |  | (3,703) |  | (3,419) |  | (5,760) |  | (7,309) | (22,950) |
Provision (benefit) for income taxes |  |  | (6,423) |  | (720) |  | (6,469) |  | (9,313) | (10,518) |
Net income (loss) |  | $ 7,407 | $ 4,147 |  | $ (1,299) |  | $ 4,879 |  | $ 7,942 | $ (7,431) | $ 8,217
Basic net income (loss) per share |  |  | $ 0.15 |  | $ (0.05) |  | $ 0.18 |  | $ 0.29 | $ (0.35) |
Diluted net income (loss) per share |  |  | $ 0.15 |  | $ (0.05) |  | $ 0.18 |  | $ 0.29 | $ (0.35) |
Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expense |  |  |  |  | $ 90 |  | $ (509) |  | $ (37) | $ 37 |
Income (loss) from operations |  |  |  |  | (90) |  | 509 |  | 37 | (37) |
Write-off of unamortized debt issuance costs |  |  |  |  |  |  |  |  | (500) | 500 |
Interest expense |  |  | $ (466) |  |  |  |  |  |  |  |
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture |  |  | 466 |  | (90) |  | 509 |  | 537 | (537) |
Provision (benefit) for income taxes |  |  | 158 |  | (31) |  | 173 |  | 1,180 | (1,180) |
Net income (loss) |  |  | $ 308 |  | (59) |  | $ 336 |  | $ (643) | $ 643 |
Basic net income (loss) per share |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ (0.02) | $ 0.03 |
Diluted net income (loss) per share |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ (0.02) | $ 0.03 |
As Revised [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expense |  |  | $ 18,347 |  | 20,802 |  | $ 60,142 |  | $ 80,229 | $ 51,782 |
Income (loss) from operations |  |  | 18,727 |  | 11,784 |  | 47,813 |  | 59,437 | 26,760 |
Write-off of unamortized debt issuance costs |  |  |  |  |  |  |  |  | 2,589 | 19,173 |
Interest expense |  |  | 15,871 |  |  |  | 48,924 |  |  |  |
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture |  |  | (3,237) |  | (3,509) |  | (5,251) |  | (6,772) | (23,487) |
Provision (benefit) for income taxes |  |  | (6,265) |  | (751) |  | (6,296) |  | (8,133) | (11,698) |
Net income (loss) |  |  | $ 4,455 |  | $ (1,358) |  | $ 5,215 |  | $ 7,299 | $ (6,788) |
Basic net income (loss) per share |  |  | $ 0.16 |  | $ (0.05) |  | $ 0.19 |  | $ 0.27 | $ (0.32) |
Diluted net income (loss) per share |  |  | $ 0.16 |  | $ (0.05) |  | $ 0.19 |  | $ 0.27 | $ (0.32) |
[1] | Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)

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