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Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Investment in direct financing leases, net $ 79,767,000   $ 79,767,000     $ 82,366,000
Impairments 507,000 $ 701,000 1,538,000 $ 1,472,000    
Notes and mortgages receivable $ 29,675,000   $ 29,675,000     $ 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%   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%   7.00%      
Properties [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Impairments     $ 306,000 362,000    
Estimated Sale Price Method [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Impairments     260,000      
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     1,161,000      
Notes and Mortgages Receivable [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Impairments $ 0 0 0 0    
Direct Financing Leases Financing Receivable [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Impairments 0 $ 0 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   0      
Accounting Standards Update 2016-13 [Member] | Construction Loans [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Notes and mortgages receivable 2,200,000   2,200,000      
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