Real Estate Activities - Development Activities - Additional Information (Detail) $ in Thousands			3 Months Ended	12 Months Ended
	Dec. 17, 2019 Hospital	Oct. 25, 2019 USD ($)	Jun. 30, 2020 Hospital	Dec. 31, 2020 USD ($) Hospital	Dec. 31, 2018 USD ($)	Nov. 23, 2020 USD ($)	May 15, 2020 USD ($)
Business Acquisition [Line Items]
Expected commence rent | $				$ 95,629
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital	10			2
Behavioral Hospital [Member] | Houston, Texas [Member]
Business Acquisition [Line Items]
Estimated total development cost | $		$ 27,500
Development Activities [Member] | Ernest [Member]
Business Acquisition [Line Items]
Expected commence rent | $						$ 47,700	$ 47,900
Estimated total development cost | $					$ 25,500
Initial fixed term of lease					2037
Development Activities [Member] | Circle [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital			2
Development Activities [Member] | Circle [Member] | Acute Care Hospital [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital			1
Development Activities [Member] | Circle [Member] | Inpatient Rehabilitation Hospital [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital			1