Acquisitions and Divestitures - Additional Information (Detail) $ in Thousands	1 Months Ended				9 Months Ended
	Mar. 31, 2022 USD ($) ft²	Jan. 31, 2022 USD ($) ft² Time Tenant	Jun. 30, 2021 USD ($)	May 31, 2021 USD ($) ft²	Sep. 30, 2022 Disposition	Sep. 30, 2021 USD ($)
Business Acquisitions And Dispositions [Line Items]
Number of dispositions | Disposition					0
Gain on sale of real estate assets						$ 1,304
Medical Office Buildings
Business Acquisitions And Dispositions [Line Items]
Sale price net of closing costs			$ 3,200
Gain on sale of real estate assets						$ 1,300
Fire Mesa Office Building [Member]
Business Acquisitions And Dispositions [Line Items]
Rentable square feet | ft²				44,000
Lease expiration date				Aug. 31, 2027
Payment to acquire business				$ 12,900
Lease percentage				100.00%
Beaumont Heart And Vascular Center | Dearborn Michigan
Business Acquisitions And Dispositions [Line Items]
Total purchase price	$ 5,400
Percentage of building area leased	100.00%
Rentable square feet | ft²	17,621
Lease expiration date	Nov. 30, 2026
Lease commencing date	Dec. 01, 2022
Percentage of lease escalations	2.5
140 Thomas Johnson Drive Medical Office Building | Frederick, Maryland
Business Acquisitions And Dispositions [Line Items]
Rentable square feet | ft²		20,146
Payment to acquire business		$ 8,000
Percentage of lease		100.00%
Number of tenants | Tenant		3
Percentage of rentable square feet		72.00%
Term of lease		15 years
Remaining lease term		14 years
Number of term renewal options | Time		3
Renewal Term (years)		5 years