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Lease Intangibles - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite Lived Intangible Assets [Line Items] |  |  |
Below-market leases, net | $ 1,457,204 | $ 1,698,086 | $ 2,154,479
Weighted average [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 3 years 6 months | 3 years 9 months 18 days |

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- Definition Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Details
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