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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 14,121  
2020 343,849  
2021 20,337  
2022 274,231  
2023 721,360  
Thereafter 440,897  
Total debt $ 1,814,795 $ 1,459,000