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Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Lease
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Property
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Number of leases modified | Lease 1        
Impairments $ 675,000 $ 986,000 $ 2,467,000 $ 3,970,000  
Notes and mortgages receivable 39,004,000   39,004,000   $ 112,008,000
Aggregate purchase price of properties acquired during the period     $ 204,488,000 192,988,000  
Number of property whose construction is completed | Property     11    
Finance receivables 55,100,000   $ 55,100,000    
Prior modification of direct financing lease net investment 11,200,000        
Direct Financing Leases Financing Receivable [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Impairments 0 0 0 0  
Properties [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Impairments     500,000 1,400,000  
Estimated Sale Price Method [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Impairments     900,000 0  
Discounted Cash Flow Method [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Impairments     0 1,600,000  
Accumulation of Asset Retirement Cost Method [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Impairments     1,600,000 2,400,000  
Accounting Standards Update 2016-13 [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Proceeds from construction loans and development financing     9,200,000    
Aggregate purchase price of properties acquired during the period     12,100,000    
Accounting Standards Update 2016-13 [Member] | Direct Financing Leases Financing Receivable [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Additional allowance for credit losses 0 $ 0 0 $ 0  
Accounting Standards Update 2016-13 [Member] | Construction Loans and Development Financing [Member]          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Notes and mortgages receivable 13,400,000   $ 13,400,000    
Number of property whose construction is completed | Property     11    
Finance receivables 41,900,000   $ 41,900,000    
Accounting Standards Update 2016-13 [Member] | Notes And Mortgages Receivable          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Additional allowance for credit losses 200,000   200,000   $ 200,000
Aggregate purchase price of properties acquired during the period     $ 18,600,000    
Number of property whose construction is completed | Property     10    
Finance receivables $ 51,300,000   $ 51,300,000