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Prior Periods Financial Statement Revision - Schedule of Revision on Changes in Stockholders' Equity (Detail) - USD ($) $ 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] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 132,895 | $ 7,407 | $ 4,455 | [1] | $ (1,358) | $ 118,561 | $ 5,215 | [1] | $ 7,299 |  | $ (6,788) | $ 8,217
Change in fair value of interest rate hedge |  |  | 2,244 | [1] | (635) |  | 2,025 | [1] | 1,910 |  | (1,637) | (273)
Foreign currency translation gain (loss) | 6,083 | 5,004 | (378) | [1] | 7,223 | 20,327 | 1,774 | [1] | (9,727) |  | (25,011) | (18,599)
Accumulated other comprehensive income (loss) |  | (24,804) |  |  |  |  |  |  | (29,808) |  | (21,992) | 4,657
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  | 277,917 |
Total stockholders' equity | $ 441,304 | 323,491 |  |  |  | $ 441,304 |  |  | 310,513 | [1],[2] | 312,020 | 172,989
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 7,407 | 4,147 |  | (1,299) |  | 4,879 |  | 7,942 |  | (7,431) | 8,217
Change in fair value of interest rate hedge |  |  | 4,211 |  | (1,002) |  | 3,130 |  | 3,015 |  | (2,584) | (431)
Foreign currency translation gain (loss) |  | 4,706 | 382 |  | 6,719 |  | 4,176 |  | (8,984) |  | (21,936) | (17,731)
Accumulated other comprehensive income (loss) |  | (20,416) |  |  |  |  |  |  | (25,122) |  | (19,153) | 5,367
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  | 277,582 |
Total stockholders' equity |  | 327,879 |  |  |  |  |  |  | 315,199 |  | 313,881 | 173,699
Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  | 308 |  | (59) |  | 336 |  | (643) |  | 643 |
Change in fair value of interest rate hedge |  |  | (1,967) |  | 367 |  | (1,105) |  | (1,105) |  | 947 | 158
Foreign currency translation gain (loss) |  | 298 | $ (760) |  | $ 504 |  | $ (2,402) |  | (743) |  | (3,075) | (868)
Accumulated other comprehensive income (loss) |  | (4,388) |  |  |  |  |  |  | (4,686) |  | (2,839) | (710)
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  | 335 |
Total stockholders' equity |  | $ (4,388) |  |  |  |  |  |  | $ (4,686) |  | $ (1,861) | $ (710)
[1] | Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)
[2] | Includes the effects of prior periods' revisions (Note 1 and Note 15)

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