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Obligations Under Non-Cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 4,021
2020 3,599
2021 3,263
2022 2,213
2023 1,316
2024 and thereafter 3,622
Minimum operating lease payments $ 18,034