Real Estate and Other Activities - Development Activities - Additional Information (Detail) $ in Thousands			3 Months Ended	12 Months Ended
	Dec. 17, 2019 Hospital	Oct. 25, 2019 USD ($)	Jun. 30, 2020 Hospital	Dec. 31, 2021 USD ($) Hospital	Dec. 31, 2019 Hospital	Nov. 23, 2020 USD ($)	May 15, 2020 USD ($)
Business Acquisition [Line Items]
Expected commence rent | $				$ 265,037
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired	10			2
Behavioral Hospital [Member] | Houston, Texas [Member]
Business Acquisition [Line Items]
Estimated total development cost | $		$ 27,500
Ernest [Member]
Business Acquisition [Line Items]
Number of facilities acquired					4
Development Activities [Member] | Ernest [Member]
Business Acquisition [Line Items]
Expected commence rent | $						$ 47,700	$ 47,900
Development Activities [Member] | Circle [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired			2
Development Activities [Member] | Circle [Member] | Acute Care Hospital [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired			1
Development Activities [Member] | Circle [Member] | Inpatient Rehabilitation Hospital [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired			1
Development Activities [Member] | Steward [Member]
Business Acquisition [Line Items]
Expected commence rent | $				$ 169,400