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Commitments and Contingencies - Schedule of Future Minimum Annual Commitments Under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 16,926
2020 12,765
2021 9,597
2022 5,753
2023 3,721
Thereafter 32,852
Total future minimum annual commitments under operating lease obligations $ 81,614