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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)