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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) DeferredPaymentPlan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Federal Deposit Insurance Corporation deposit insurance limit per institution | $ 250,000 |  |
Restricted cash | $ 4,864,000 | $ 4,545,000 |
Acquisition of above-market in-place leases, amortization period | 6 months |  |
Amortization expense for intangible assets | $ 631,000 | 1,599,000 | $ 3,433,000
Write-off of fully amortized intangible assets | 1,171,000 | 1,846,000 | 4,153,000
Amortization expense for intangible assets expected for 2020 | 781,000 |  |
Depreciation expense | 60,056,000 | 51,216,000 | 41,788,000
Write-off of fully depreciated fixed assets | 3,921,000 | 940,000 |
Casualty losses | 711,000 | 0 | 46,000
Bad debt expense | $ 1,842,000 | 1,142,000 | 644,000
Number of deferred payment plans | DeferredPaymentPlan | 276 |  |
Rent deferment | $ 515,000 |  |
Deferred rent receivable from residents | 175,000 |  |
Advertising expenses | 2,338,000 | 2,350,000 | 2,172,000
Income tax expense | $ 0 | $ 0 | $ 0
Percentage of minimum taxable income distributable to stockholders | 90.00% |  |
Subsequent disqualification period if failed to qualify as REIT | 4 years |  |
Dividends characterized as capital gain distributions | 20.00% | 69.00% | 37.00%
Dividends characterized as ordinary income percentage | 37.00% | 16.00% | 39.00%
Dividends characterized as return of capital | 43.00% | 15.00% | 24.00%
Topic 842 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Right-of-use assets | $ 2,649,000 | $ 2,812,000 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssets | us-gaap:OtherAssets |
Lease liability | $ 3,002,000 | $ 3,176,000 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilities | us-gaap:OtherLiabilities |
Total operating lease expense | $ 616,000 | $ 589,000 |
Natural Disasters and Other Insurable Events |  |  |
Significant Accounting Policies [Line Items] |  |  |
Rent revenue recognized | 208,000 | 156,000 | $ 195,000
COVID-19 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Bad debt expense | $ 927,000 |  |
North Carolina |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 16.88% |  |
Tennessee |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 10.73% |  |
Georgia |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 14.08% |  |
Florida |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 10.46% |  |
Kentucky |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 9.30% |  |
Ohio |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 9.24% |  |
Texas |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 7.07% |  |
Building and Building Improvements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 40 years |  |
Leases Acquired In Place |  |  |
Significant Accounting Policies [Line Items] |  |  |
Acquisition of above-market in-place leases | $ 1,013,000 | $ 1,265,000 |
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rent deferment on monthly rent | 25.00% |  |
Deferred rent payment term | 1 month |  |
Minimum | Furniture, Fixtures and Equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 5 years |  |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents original maturity period | 3 months |  |
Percentage of rent deferment on monthly rent | 75.00% |  |
Deferred rent payment term | 3 months |  |
Maximum | Topic 842 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Operating lease term | 10 years |  |
Maximum | Furniture, Fixtures and Equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 10 years |  |

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