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Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Investment in direct financing leases, net $ 80,806,000     $ 82,366,000
Impairments 1,031,000 $ 771,000    
Notes and mortgages receivable $ 28,648,000     $ 30,855,000
Level 3 [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Assumed annual average rent increases for unobservable inputs 2.00%      
Level 3 [Member] | Measurement Input Expected Term [Member] | Maximum [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Assumed holding periods for unobservable inputs 15 years      
Level 3 [Member] | Measurement Input Cap Rate [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Real estate fair value, measurement input 8.00%      
Level 3 [Member] | Measurement Input Discount Rate [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Real estate fair value, measurement input 7.00%      
Properties [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Impairments $ 206,000 199,000    
Estimated Sale Price Method [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Impairments 241,000      
Discounted Cash Flow Method [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Impairments 117,000      
Accumulation of Asset Retirement Cost Method [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Impairments 673,000      
Notes and Mortgages Receivable [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Impairments 0 0    
Direct Financing Leases Financing Receivable [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Impairments 0 $ 0    
Accounting Standards Update 2016-13 [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Investment in direct financing leases, net     $ 82,366,000  
Estimated credit loss reserve related to direct financing leases     578,000  
Credit loss reserve     309,000  
Notes and mortgages receivable     $ 30,855,000  
Accounting Standards Update 2016-13 [Member] | Notes and Mortgages Receivable [Member]        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Additional allowance for credit losses 0      
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