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Lease Intangibles (Net Value of Other Intangible Assets and Amortization by Class) (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Finite Lived Intangible Assets [Line Items] |  |  |
Lease intangibles | $ 12,235,417 | $ 12,663,629 | $ 13,845,100
Lease intangibles, net | 4,498,785 | 5,866,534 |
HLF [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Lease intangibles | 13,383,080 | 13,811,291 | 13,845,100
Accumulated amortization | (8,884,295) | (7,944,757) | (5,829,342)
Lease intangibles, net | 4,498,785 | 5,866,534 | 8,015,758
Leases, Acquired-in-Place [Member] | HLF [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Lease intangibles | 6,635,928 | 6,872,980 | 6,903,882
Accumulated amortization | (4,369,040) | (3,840,670) | (2,647,002)
Lease intangibles, net | 2,266,888 | 3,032,310 | 4,256,880
Leasing Cost [Member] | HLF [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Lease intangibles | 4,622,792 | 4,813,951 | 4,816,858
Accumulated amortization | (2,849,914) | (2,517,759) | (1,766,578)
Lease intangibles, net | 1,772,878 | 2,296,192 | 3,050,280
Above Market Leases [Member] | HLF [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Lease intangibles | 2,124,360 | 2,124,360 | 2,124,360
Accumulated amortization | (1,665,341) | (1,586,328) | (1,415,762)
Lease intangibles, net | $ 459,019 | $ 538,032 | $ 708,598

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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