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Concentration of Credit Risk - Additional Information (Detail)
Sep. 30, 2017
State
Concentration of Credit Risk  
Minimum Percent Share Of Each State Annualized Base Rent That Company Owned 10.00%
Number of states with more than ten percent of tenant annual base rent 3
Number of tenants with more than ten percent of annual base rent 2
Minimum percent share of annualized base rent accounted by tenants 10.00%
NEVADA  
Concentration of Credit Risk  
Percentage of annual base rent 17.20%
ALABAMA  
Concentration of Credit Risk  
Percentage of annual base rent 15.30%
CALIFORNIA  
Concentration of Credit Risk  
Percentage of annual base rent 12.60%