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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	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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