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Future Minimum Payments Under Non Cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases Future Minimum Payments [Line Items]  
2019 $ 16,238
2020 14,898
2021 14,498
2022 14,744
2023 14,589
Thereafter 62,698
Total $ 137,665