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% |