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Commitments and Contingencies - Future Minimum Commitments under Non-Cancelable Operating Leases with Initial or Remaining Terms of One Year or More (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 4,639
2020 4,036
2021 3,644
2022 2,814
2023 1,831
Thereafter 2,636
Future minimum lease payments $ 19,600