Real Estate and Other Activities - 2023 Activity - Additional Information (Detail) $ in Thousands, £ in Millions					1 Months Ended	3 Months Ended			6 Months Ended
	May 23, 2023 USD ($)	Apr. 14, 2023 GBP (£) Facility	Feb. 07, 2023 USD ($) Facility	Apr. 25, 2022 USD ($) Facility	Aug. 31, 2019 USD ($) Hospital	Jun. 30, 2023 GBP (£) Facility	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) Facility
Business Acquisition [Line Items]
Net impairment charge							$ 79,000
Additional mortgage loan									$ 235,187	$ 946,243
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
Convertible loan									586,000
Massachusetts [Member]
Business Acquisition [Line Items]
Redevelopment recovery receivables of prior storm and flood damage									130,000
Advancement of redevelopment recovery receivables									50,000
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
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									68,000
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
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				$ 80,000
Number of facilities acquired | Facility			8	2						5
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