Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
property
segment
partnership
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Property, Plant and Equipment [Line Items]      
Number of properties | property 1,050    
Net book value of real estate owned $ 4,917,815,000 $ 5,618,911,000  
Carrying value 3,668,757,000 3,560,570,000  
Real estate impairment charges 0 0 $ 0
Asset held for sale 550,199,000 0  
Advertising expenses 15,300,000 10,000,000 6,600,000
Deferred tax liabilities 0 0  
Deferred tax asset 0 0  
Unrecognized tax benefits $ 0 $ 0  
Common shares of beneficial interest, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01  
Number of reportable segments | segment 1    
Goodwill impairment $ 0 $ 0  
Disposal Group, Held-for-Sale, Not Discontinued Operations      
Property, Plant and Equipment [Line Items]      
Asset held for sale $ 550,200,000    
Number of real estate properties to be disposed of | property 39    
Disposal Group, Held-for-Sale, Not Discontinued Operations | Participating Regional Operators In Eight States      
Property, Plant and Equipment [Line Items]      
Number of properties | property 39    
Disposal Group, Held-for-Sale, Not Discontinued Operations | Participating Regional Operators In Seven States      
Property, Plant and Equipment [Line Items]      
Number of properties | property 56    
Tenant insurance and tenant warranty protection plan      
Property, Plant and Equipment [Line Items]      
Revenue $ 24,100,000 19,800,000 15,000,000
Retail products and supplies      
Property, Plant and Equipment [Line Items]      
Revenue 2,300,000 2,600,000 2,300,000
Property management fees, call center fees, and platform fees      
Property, Plant and Equipment [Line Items]      
Revenue $ 16,800,000 16,500,000 14,800,000
Property management fees as percent of monthly gross revenues and net sales revenues from the assets of the unconsolidated real estate ventures 6.00%    
Platform fees per month per unconsolidated real estate venture property $ 1,250    
Call center fees as percent of of monthly gross revenues and net sales revenues from the 2016 Joint Venture properties 1.00%    
Acquisition fees      
Property, Plant and Equipment [Line Items]      
Revenue $ 0 1,200,000 800,000
Tenant warranty protection or tenant insurance      
Property, Plant and Equipment [Line Items]      
Revenue $ 17,200,000 9,500,000 $ 7,300,000
Percent of total warranty protection plan proceeds received per unconsolidated real estate venture property (percent) 50000000.00%    
Customer in-place leases      
Property, Plant and Equipment [Line Items]      
Estimated useful life 12 months    
Minimum | Buildings and Improvements      
Property, Plant and Equipment [Line Items]      
Useful life 7 years    
Minimum | Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Maximum | Buildings and Improvements      
Property, Plant and Equipment [Line Items]      
Useful life 40 years    
Maximum | Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Useful life 10 years    
Fixed rate mortgages payable | Mortgages      
Property, Plant and Equipment [Line Items]      
Carrying value $ 222,757,000 299,570,000  
VIE, Primary Beneficiary      
Property, Plant and Equipment [Line Items]      
Number of partnerships considered to be VIEs | partnership 22    
Number of properties | property 49    
Net book value of real estate owned $ 418,900,000 412,900,000  
VIE, Primary Beneficiary | Fixed rate mortgages payable | Mortgages      
Property, Plant and Equipment [Line Items]      
Carrying value $ 188,700,000 $ 188,700,000