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Concentrations Risk - Additional Information (Detail) - Property
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Wholly Owned Properties [Member]    
Concentration Risk [Line Items]    
Number of properties 89 79
CALIFORNIA    
Concentration Risk [Line Items]    
Number of properties 17 18
Rentable Square Feet [Member] | Credit Concentration Risk [Member] | CALIFORNIA    
Concentration Risk [Line Items]    
Percentage of concentrations risk 15.50% 18.50%
U.S. Government [Member] | Lease Income [Member] | Credit Concentration Risk [Member]    
Concentration Risk [Line Items]    
Percentage of concentrations risk 96.00% 96.40%
Non Governmental Tenants [Member] | Lease Income [Member] | Credit Concentration Risk [Member]    
Concentration Risk [Line Items]    
Percentage of concentrations risk 4.00% 3.60%