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Aggregate Minimum Future Payments, Net of Sublease Income, Required on Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 78,506
2020 72,191
2021 80,914
2022 79,094
2023 77,248
Thereafter 273,347
Total $ 661,300