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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 (remainder) $ 11,245  
2020 343,849  
2021 20,337  
2022 274,231  
2023 734,360  
Thereafter 472,038  
Total debt $ 1,856,060 $ 1,814,795