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Operating Leases - Schedule of Future Minimum Lease Payments Under Non-cancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases, Operating [Abstract]  
2019 $ 19,649
2020 19,287
2021 16,833
2022 12,368
2023 8,805
Thereafter 10,452
Total future minimum lease payments $ 87,394