Summarized Financial Information of Equity Affiliates - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021 Property
Grayson Properties Member
Schedule Of Equity Method Investments [Line Items]
Minority ownership interest held by a third-party	5.00%
Ownership percentage upon completion of the minority ownership purchase	100.00%
Limited Liability Companies | Medical Office Buildings [Member]
Schedule Of Equity Method Investments [Line Items]
Number of real estate investments	5
Minimum
Schedule Of Equity Method Investments [Line Items]
Number of days for Non-Offering Member either to purchase or sell its entire ownership interest to or from Offering Member	60 days
Maximum
Schedule Of Equity Method Investments [Line Items]
Number of days for Non-Offering Member either to purchase or sell its entire ownership interest to or from Offering Member	90 days
4 Unconsolidated Limited Liability Companies / Limited Partner | Minimum
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	33.00%
4 Unconsolidated Limited Liability Companies / Limited Partner | Maximum
Schedule Of Equity Method Investments [Line Items]
Non-controlling equity interest, ownership percentage	95.00%