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Segment Information and Sales to Significant Customers - Summary of Revenue by Nature of Activities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 1,052,948 $ 1,026,201 $ 1,047,933 $ 1,041,957 $ 1,030,253 $ 1,024,704 $ 1,019,657 $ 1,012,055 $ 4,169,039 $ 4,086,669 $ 3,974,837
Managed services arrangements [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 2,398,691 2,246,279 2,051,589
Other [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 1,770,348 $ 1,840,390 $ 1,923,248