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Summary of Significant Accounting Policies - Derivative Instruments and Mortgage Debt Measured at Fair Value (Detail) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Level 1 [Member] | Unsecured Notes [Member] |  |
Derivatives Fair Value [Line Items] |  |
Debt instruments measured at fair value | $ (26,109,600) | $ (26,241,160)
Level 2 [Member] | Interest Rate Cap [Member] |  |
Derivatives Fair Value [Line Items] |  |
Interest rate cap | 6,390 | 33,597
Level 2 [Member] | Mortgage Loans [Member] |  |
Derivatives Fair Value [Line Items] |  |
Debt instruments measured at fair value | $ (290,996,165) | $ (281,840,780)

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