Real Estate and Other Activities - 2023 Activity - Additional Information (Detail) $ in Thousands			1 Months Ended	3 Months Ended			12 Months Ended
	May 23, 2023 USD ($)	Feb. 07, 2023 USD ($) Facility	Aug. 31, 2019 USD ($) Hospital	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)
Business Acquisition [Line Items]
Net impairment charge				$ 220,000	$ 79,000
Additional mortgage loan				0	72,900
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]
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
Additional mortgage loan								$ 100,000
Investment, Type [Extensible Enumeration]				Mortgage Loans [Member]
Pay down of debt instruments	$ 375,000
Reconstitution of asset	1,700,000
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]
First lien secured loan	150,000
Prospect [Member] | PHP Holdings [Member]
Business Acquisition [Line Items]
Revenue for rent and interest							$ 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
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]
Number of facilities acquired | Facility		8
Lease extension expiration term		5 years
Lease extension expiration year		2041
Springstone Health Opco, LLC [Member]
Business Acquisition [Line Items]
Purchase price of acquisition		$ 250,000
Sale of minority equity investment				$ 12,000
Additional mortgage loan		$ 205,000
Springstone Health Opco, LLC [Member] | Behavioral Health Hospitals [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Facility		18