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Commitments and Contingencies - Schedule of Future Minimum Payments (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Operating, 2018 $ 15,754
Operating, 2019 22,179
Operating, 2020 23,579
Operating, 2021 26,395
Operating, 2022 26,748
Operating, Thereafter 135,558
Operating, Total $ 250,213