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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021 USD ($) JointVenture | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Federal Deposit Insurance Corporation deposit insurance limit per institution | $ 250,000 |  |
Restricted cash | $ 29,699,000 | $ 4,864,000 |
Acquisition of above-market in-place leases, amortization period | 6 months |  |
Amortization expense for intangible assets | $ 5,125,000 | 631,000 | $ 1,599,000
Write-off of fully amortized intangible assets | 1,549,000 | 1,171,000 | 1,846,000
Amortization expense for intangible assets expected for 2021 | 53,269,000 |  |
Depreciation expense | 70,578,000 | 60,056,000 | 51,216,000
Write-off of fully depreciated fixed assets | 4,607,000 | 3,921,000 | 940,000
Casualty losses | 359,000 | 711,000 | 0
Investments in unconsolidated real estate entities | 24,999,000 |  |
Income or losses from equity method investments | 0 | 0 |
Investment in real estate under development | 41,777,000 | 0 |
Provision for bad debts | 2,862,000 | 1,842,000 | 1,142,000
Advertising expenses | 2,511,000 | 2,338,000 | 2,350,000
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 | 100.00% | 20.00% | 69.00%
Dividends characterized as ordinary income percentage | 0.00% | 37.00% | 16.00%
Dividends characterized as return of capital |  | 43.00% | 15.00%
Topic 842 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Right-of-use assets | $ 2,919,000 | $ 2,649,000 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets |
Lease liability | $ 3,255,000 | $ 3,002,000 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities | Other liabilities
Total operating lease expense | $ 706,000 | $ 616,000 | $ 589,000
Natural Disasters and Other Insurable Events |  |  |
Significant Accounting Policies [Line Items] |  |  |
Rent revenue recognized | 88,000 | 208,000 | $ 156,000
COVID-19 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Provision for bad debts | $ 629,000 | 927,000 |
Richmond, VA and Nashville, TN |  |  |
Significant Accounting Policies [Line Items] |  |  |
Number of joint ventures | JointVenture | 2 |  |
North Carolina |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 17.02% |  |
Georgia |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 10.52% |  |
Texas |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 10.34% |  |
Florida |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 10.08% |  |
Tennessee |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 9.72% |  |
Ohio |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 9.29% |  |
Kentucky |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 9.08% |  |
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 | $ 58,806,000 | $ 1,013,000 |
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 |  |
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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