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Commitments and Contingencies - Future Minimum Annual Rental Commitments under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 7,558
2020 6,492
2021 5,960
2022 5,286
2023 1,676
Thereafter $ 2,501