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Identified Intangible Liabilities, Net - Summary of Amortization Expense on Below Market Leases (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Intangible Liabilities [Abstract]    
2018 $ 173,000  
2019 318,000  
2020 154,000  
2021 129,000  
2022 120,000  
Thereafter 678,000  
Identified intangible liabilities, net $ 1,572,000 $ 1,737,000