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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 (remainder) $ 4,184  
2020 343,849  
2021 20,337  
2022 274,231  
2023 709,360  
Thereafter 523,461  
Total debt $ 1,875,422 $ 1,814,795