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Leases - Minimum Lease Payments under Operating Leases (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2019 $ 20,106
2020 17,142
2021 10,325
2022 5,573
2023 4,411
Thereafter 8,739
Total minimum lease payments $ 66,296