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Commitments - Future Contractual Obligations for Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 12,498
2020 11,762
2021 10,145
2022 8,552
2023 7,856
Thereafter 22,222
Total minimum lease payments $ 73,035