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Identified Intangible Liabilities, Net - Summary of Identified Intangibles, Net (Detail) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Liabilities [Line Items]    
Identified intangible liabilities, net $ 1,486,000 $ 1,737,000
Below Market Lease [Member]    
Finite Lived Intangible Liabilities [Line Items]    
Identified intangible liabilities, net 1,102,000 1,349,000
Above-market leasehold interest [Member]    
Finite Lived Intangible Liabilities [Line Items]    
Identified intangible liabilities, net $ 384,000 $ 388,000