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Lease Agreements - Future Contractual Payments Under Noncancelable Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 163,489
2020 146,425
2021 125,372
2022 101,778
2023 79,903
Thereafter 244,801
Total future contractual payments $ 861,768