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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 1,087,309 $ 1,066,254 $ 1,048,734 $ 1,086,343 $ 1,052,948 $ 1,026,201 $ 1,047,933 $ 1,041,957 $ 4,288,640 $ 4,169,039 $ 4,086,669
Managed services arrangements [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 2,546,330 2,398,691 2,246,279
Other [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 1,742,310 $ 1,770,348 $ 1,840,390