Real Estate and Lending Activities - Development Activities - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020 Hospital	Sep. 30, 2020 USD ($) Hospital	May 15, 2020 USD ($)
Business Acquisition [Line Items]
Commence rent in fourth quarter of 2021 | $		$ 75,429
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired		2
Ernest [Member] | Development Activities [Member]
Business Acquisition [Line Items]
Commence rent in fourth quarter of 2021 | $			$ 47,900
Circle [Member] | Development Activities [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired	2
Circle [Member] | Development Activities [Member] | Acute Care Hospital [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired	1
Circle [Member] | Development Activities [Member] | Inpatient Rehabilitation Hospital [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired	1