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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Significant Accounting Policies [Line Items] |  |  |
Federal Deposit Insurance Corporation deposit insurance limit per institution | $ 250,000 |  |
Restricted cash | $ 4,449,000 |  | $ 4,864,000
Acquisition of above-market in-place leases, amortization period | 6 months |  |
Amortization expense for intangible assets | $ 396,000 | $ 371,000 |
Write-off of fully amortized intangible assets | 0 | 447,000 |
Additional amortization expense on current in-place intangible assets for the remainder of 2021 | 396,000 |  |
Depreciation expense | 16,156,000 | 14,457,000 |
Write-off of fully depreciated fixed assets | 1,506,000 | 0 |
Casualty losses | 359,000 |  |
Bad debt expense | 433,000 | 337,000 |
Deferred rent receivable from residents | 41,000 |  |
Advertising expenses | 544,000 | 608,000 |
Transfers of assets between Level 1 and Level 2 | 0 |  |
Transfers of assets between Level 2 and Level 1 | 0 |  |
Transfers of liabilities between Level 1 and Level 2 | 0 |  |
Transfers of liabilities between Level 2 and Level 1 | 0 |  |
Income tax expense | $ 0 | 0 |
Percentage of minimum taxable income distributable to stockholders | 90.00% |  |
Subsequent disqualification period if failed to qualify as REIT | 4 years |  |
Topic 842 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Right-of-use assets | $ 2,553,000 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets |  |
Lease liability | $ 2,903,000 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities |  |
Total operating lease expense | $ 172,000 |  |
Natural Disasters and Other Insurable Events |  |  |
Significant Accounting Policies [Line Items] |  |  |
Rent revenue recognized | 23,000 | $ 3,000 |
COVID-19 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Bad debt expense | $ 47,000 |  |
Building and Building Improvements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 40 years |  |
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rent deferment on monthly rent | 25.00% |  |
Deferred rent payment term | 1 month |  |
Minimum | Equipment and Fixtures |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 5 years |  |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents 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 | Equipment and Fixtures |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 10 years |  |

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