Real Estate and Other Activities - 2023 Activity - Additional Information (Detail) $ in Thousands, £ in Millions						1 Months Ended		3 Months Ended				9 Months Ended
	May 23, 2023 USD ($)	Apr. 14, 2023 GBP (£) Facility	Feb. 07, 2023 USD ($) Facility	Jul. 29, 2022 USD ($)	Apr. 25, 2022 USD ($) Facility	Oct. 31, 2023 USD ($)	Aug. 31, 2019 USD ($) Hospital	Sep. 30, 2023 USD ($)	Jun. 30, 2023 GBP (£) Facility	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) Facility	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Business Acquisition [Line Items]
Net impairment charge										$ 82,000
Additional mortgage loan								$ 235,187				$ 235,187	$ 972,243
Mortgage Loans [Member]
Business Acquisition [Line Items]
Additional mortgage loan													$ 100,000
PHP Holdings [Member]
Business Acquisition [Line Items]
Capital restructuring costs												654,000
Equity investment								68,000				68,000
Convertible loan								586,000				586,000
Massachusetts [Member]
Business Acquisition [Line Items]
Redevelopment recovery receivables of prior storm and flood damage								130,000				130,000
Advancement of redevelopment recovery receivables														$ 50,000
Funding of redevelopment recovery receivables.								175,000
Prospect [Member]
Business Acquisition [Line Items]
Purchase price of acquisition							$ 1,500,000
Term loan							$ 112,900
Net impairment charge											$ 280,000
Pay down of debt instruments	$ 375,000
Reconstitution of asset	1,700,000
First lien secured loan	25,000					$ 20,000		20,000
Prospect [Member] | Maximum [Member]
Business Acquisition [Line Items]
First lien secured loan	75,000
Prospect [Member] | Acute Care Campus [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital							14
Prospect [Member] | Mortgage Loans [Member]
Business Acquisition [Line Items]
Additional mortgage loan															$ 100,000
Prospect [Member] | PHP Holdings [Member]
Business Acquisition [Line Items]
Revenue for rent and interest								13,000				82,000
Unpaid rent and interest	112,900
Convertible loan										$ 50,000
Prospect [Member] | PHP Holdings [Member] | Mortgage Loans [Member]
Business Acquisition [Line Items]
Unpaid rent and interest	$ 151,000
Prospect [Member] | Pennsylvania [Member]
Business Acquisition [Line Items]
Carrying value of lease requiring residual value guarantee											170,000
Unbilled rent accruals								$ 112,000				$ 112,000
Prospect [Member] | Pennsylvania [Member] | Maximum [Member]
Business Acquisition [Line Items]
Carrying value of lease requiring residual value guarantee											$ 250,000
General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Purchase price of acquisition				$ 26,000	$ 80,000
Number of facilities acquired | Facility			8		2								6
Lease extension expiration term			5 years
Lease extension expiration year			2041
Behavioral Health Hospitals [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Facility		5							3
Payment for acquisition | £		£ 44							£ 70
Number of leased facilities | Facility		5
Springstone Health Opco, LLC [Member]
Business Acquisition [Line Items]
Purchase price of acquisition			$ 250,000
Additional mortgage loan			$ 205,000
Springstone Health Opco, LLC [Member] | Behavioral Health Hospitals [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Facility			18