Concentrations Risk - Additional Information (Detail) - Property	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Wholly Owned Properties [Member]
Concentration Risk [Line Items]
Number of properties	100	90
CALIFORNIA
Concentration Risk [Line Items]
Number of properties	18	18
Rentable Square Feet [Member] \| Credit Concentration Risk [Member] \| CALIFORNIA
Concentration Risk [Line Items]
Percentage of concentrations risk	14.20%	15.70%
U.S. Government [Member] \| Lease Income [Member] \| Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of concentrations risk	91.10%	96.00%
Non Governmental Tenants [Member] \| Lease Income [Member] \| Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of concentrations risk	5.20%	2.80%
Governmental Tenants [Member] \| Lease Income [Member] \| Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of concentrations risk	3.70%	1.20%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration