v3.20.2
Credit Risk Concentrations - Additional Information (Detail) - customer
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Concentration Risk [Line Items]          
Number of tenants or common franchises 0 0 0 0  
Operating Expenses | Management Contracts Concentration Risk          
Concentration Risk [Line Items]          
Concentrations risk percentage 0.00% 19.00% 4.00% 19.00%  
Mortgages and Notes Payable | Credit Availability Concentration Risk | Financial Institution One          
Concentration Risk [Line Items]          
Concentrations risk percentage     62.00%   62.00%
Mortgages and Notes Payable | Credit Availability Concentration Risk | Financial Institution Two          
Concentration Risk [Line Items]          
Concentrations risk percentage     16.00%   16.00%
Mortgages and Notes Payable | Credit Availability Concentration Risk | Financial Institution Three          
Concentration Risk [Line Items]          
Concentrations risk percentage     10.00%   10.00%