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Debt - Schedule of Principal Repayments of Mortgage Payable (Detail) - Secured Debt [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 $ 69,705  
2019 5,049  
2020 6,086  
2021 88,110  
2022 4,772  
Thereafter 320,755  
Total $ 494,477 $ 374,909