Real Estate and Intangibles - Fair Values of Assets Acquired and Liabilities Assumed (Detail) - Operating Properties Acquired [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
FBI Tampa and NARA [Member]
Business Acquisition [Line Items]
Land		$ 9,795
Building		83,403
Acquired tenant improvements		$ 5,386
Investment, Type [Extensible Enumeration]		us-gaap:RealEstateInvestmentMember
Total real estate		$ 98,584
Total intangible assets		12,380
Total intangible liabilities		(2,858)
Purchase price		108,106
CA - Anaheim, DHS - Atlanta and JUD - Newport News
Business Acquisition [Line Items]
Land	$ 8,407
Building	37,328
Acquired tenant improvements	$ 4,283
Investment, Type [Extensible Enumeration]	us-gaap:RealEstateInvestmentMember
Total real estate	$ 50,018
Total intangible assets	13,457
Contingent consideration	41
Contingent consideration	(388)
Purchase price	63,128
Leases, Acquired-in-Place [Member] | FBI Tampa and NARA [Member]
Business Acquisition [Line Items]
Total intangible assets		7,927
Leases, Acquired-in-Place [Member] | CA - Anaheim, DHS - Atlanta and JUD - Newport News
Business Acquisition [Line Items]
Total intangible assets	9,538
Acquired Leasing Commissions [Member] | FBI Tampa and NARA [Member]
Business Acquisition [Line Items]
Total intangible assets		4,453
Acquired Leasing Commissions [Member] | CA - Anaheim, DHS - Atlanta and JUD - Newport News
Business Acquisition [Line Items]
Total intangible assets	$ 3,919
Below Market Leases [Member] | FBI Tampa and NARA [Member]
Business Acquisition [Line Items]
Total intangible liabilities		$ (2,858)