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Borrowings - Summary of Borrowings (Detail) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Deferred financing costs related to mortgage notes and bonds payable |  | $ 0
Total borrowings, net | $ 207,347,012 | 141,678,935
Mortgage notes and bonds payable, net |  |
Debt Instrument [Line Items] |  |
Total borrowings, gross | 192,209,029 | 142,633,157
Deferred financing costs related to mortgage notes and bonds payable | (1,412,017) | (1,054,222)
Total borrowings, net | 190,797,012 | 141,578,935
Mortgage notes payable | Fixed-rate mortgage notes payable |  |
Debt Instrument [Line Items] |  |
Total borrowings, gross | $ 142,860,529 | 107,423,157
Mortgage notes payable | Fixed-rate mortgage notes payable | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 2.90% |
Mortgage notes payable | Fixed-rate mortgage notes payable | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 3.94% |
Mortgage notes payable | Fixed-rate mortgage notes payable | Weighted average |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 3.25% |
Mortgage notes payable | Variable-rate mortgage notes payable |  |
Debt Instrument [Line Items] |  |
Total borrowings, gross | $ 0 | 2,185,000
Bonds payable | Fixed-rate bonds payable |  |
Debt Instrument [Line Items] |  |
Total borrowings, gross | $ 49,348,500 | 33,025,000
Bonds payable | Fixed-rate bonds payable | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 2.38% |
Bonds payable | Fixed-rate bonds payable | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 3.29% |
Bonds payable | Fixed-rate bonds payable | Weighted average |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 2.94% |
Line of credit | Variable-rate revolving lines of credit |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 3.11% |
Line of credit | Variable-rate revolving lines of credit | Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total borrowings, net | $ 16,550,000 | $ 100,000

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