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Identified Intangible Liabilities, Net - Summary of Identified Intangibles, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite Lived Intangible Liabilities [Line Items]    
Identified intangible liabilities, net $ 1,822 $ 1,063
Below Market Lease [Member]    
Finite Lived Intangible Liabilities [Line Items]    
Identified intangible liabilities, net 1,431 1,063
Above-market leasehold interest [Member]    
Finite Lived Intangible Liabilities [Line Items]    
Identified intangible liabilities, net $ 391 $ 0