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Leases - Schedule of Maturities of Operating Lease Liabilities Presented Undiscounted Under ASC Topic 840 (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2020 $ 24,082
2021 20,875
2022 16,687
2023 13,344
2023 11,114
Thereafter 43,506
Total future minimum lease payments $ 129,608