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Leases - Schedule of Future Minimum Lease Payments on Consolidated Basis Under Company's Facility Financing Lease Obligations (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 14,379
2020 14,664
2021 14,179
2022 14,335
2023 12,872
Total minimum payments $ 70,429