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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2018 (remainder) $ 2,857  
2019 14,121  
2020 343,849  
2021 20,337  
2022 274,231  
Thereafter 1,123,289  
Total debt $ 1,778,684 $ 1,459,000