Acquisitions and Divestitures - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2021 USD ($) ft² Time	Jun. 30, 2021 USD ($) Time	Jun. 30, 2021 USD ($) Time	Jun. 30, 2020 Acquisition Disposition
Business Acquisitions And Dispositions [Line Items]
Gain on sale of real estate assets		$ 1,304	$ 1,304
Number of acquisitions | Acquisition				0
Number of dispositions | Disposition				0
Medical Office Buildings [Member]
Business Acquisitions And Dispositions [Line Items]
Sale price net of closing costs		3,200
Gain on sale of real estate assets		$ 1,300	$ 1,300
Universal Health Services, Inc
Business Acquisitions And Dispositions [Line Items]
Number of term renewal options | Time	2	6	6
Additional renewal terms			5 years
Rentable square feet | ft² | ft²	44,000
Fire Mesa Office Building [Member] | Universal Health Services, Inc
Business Acquisitions And Dispositions [Line Items]
Total purchase price	$ 12,900
Percentage of building area leased	100.00%
Additional renewal terms	5 years