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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2018 (remainder) $ 3,090  
2019 8,720  
2020 338,191  
2021 14,410  
2022 268,022  
Thereafter 875,607  
Total debt $ 1,508,040 $ 1,459,000