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Commitments and Contingencies - Minimum Lease Payments under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 20,106
2020 17,142
2021 10,325
2022 5,573
2023 4,410
Thereafter 8,739
Total minimum lease payments $ 66,295