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Commitments and Contingencies - Schedule of Future Minimum Rental Payments for Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 8,723
2020 7,009
2021 6,005
2022 5,130
2023 4,361
Thereafter 13,134
Future minimum annual rental commitments under non-cancelable leases $ 44,362