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Prior Periods Financial Statement Revision - Schedule of Revision on Condensed Consolidated Statements of Comprehensive Income (Loss) (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)
Other comprehensive income (loss) (3,160) 5,004 1,866 [1] 6,588 11,084 3,799 [1] (7,817) (26,648) (18,872)
Comprehensive income (loss) $ 129,735 12,411 6,321 [1] 5,230 $ 129,645 9,014 [1] (518) (33,436) (10,655)
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)
Other comprehensive income (loss)   4,706 4,593 5,717   7,306 (5,969) (24,520) (18,162)
Comprehensive income (loss)   12,113 8,740 4,418   12,185 1,973 (31,951) (9,945)
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)
Other comprehensive income (loss)   298 (2,727) 871   (3,507) (1,848) (2,128) (710)
Comprehensive income (loss)   $ 298 $ (2,419) $ 812   $ (3,171) $ (2,491) $ (1,485) $ (710)
[1] Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)