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Leases - Summary of Future Minimum Lease Payments Under Operating Leases with Noncancelable Lease Terms (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 76,375
2020 68,026
2021 54,853
2022 41,859
2023 28,948
Thereafter 64,732
Total lease payments $ 334,793