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Summary of Significant Accounting Policies - Schedule of Recurring Assets and Liabilities Measured at Fair Value (Detail) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Level 1 [Member] | Unsecured Notes [Member] |  |
Derivatives Fair Value [Line Items] |  |
Debt instruments measured at fair value | $ (26,000,000) |
Level 2 [Member] | Interest Rate Cap [Member] |  |
Derivatives Fair Value [Line Items] |  |
Interest rate cap | 17,942 | $ 5,213
Level 2 [Member] | Mortgage Loans [Member] |  |
Derivatives Fair Value [Line Items] |  |
Debt instruments measured at fair value | $ (352,396,367) | $ (292,368,370)

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