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 |