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Leases - Summary of Future Minimum Obligations under Operating Leases Before Adoption of ASU 842 (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Lease Liabilities Payments Due [Abstract]  
2019 $ 251,711
2020 228,716
2021 203,979
2022 178,850
2023 181,227
Thereafter 596,901
Total $ 1,641,384