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Real Estate and Other Activities - Prospect - Additional Information) (Detail) $ in Thousands		1 Months Ended	3 Months Ended				6 Months Ended
	Aug. 04, 2025 USD ($)	May 31, 2023 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Facility	Jun. 30, 2024 USD ($) Facility
Business Acquisition [Line Items]
Number of facilities sold \| Facility							3	3
Unfavorable fair market value adjustment on investment							$ 164,000	$ 585,000
Proceeds from term debt							2,512,970	804,188
Investment in loans receivable							52,435	316,000
Revenues			$ 240,359			$ 266,560	464,158	537,876
Prospect [Member]
Business Acquisition [Line Items]
Recover of investments in Prospect			660,000				660,000
Prospect [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Additional loan advances	$ 55,000
Backstop facility claims	30,000
Prospect [Member] \| PHP Holdings [Member]
Business Acquisition [Line Items]
Asset backed loan outstanding		$ 75,000
Loan impairment charges					$ 400,000
Asset impairment charges				$ 55,000
Asset impairment recoveries			18,000
Change in fair value adjustments			129,000			$ 160,000	147,000	$ 360,000
Proceeds from sale of investments							$ 2,300
Investment in loans receivable			13,500
Investment in additional loans receivable			$ 11,500
Prospect [Member] \| Minimum [Member] \| Income Valuation Approach [Member] \| Level 3 [Member]
Business Acquisition [Line Items]
Market capitalization rate							8.25%
Prospect [Member] \| Maximum [Member] \| Income Valuation Approach [Member] \| Level 3 [Member]
Business Acquisition [Line Items]
Market capitalization rate							8.50%
Prospect [Member] \| On or around August 8 [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Additional loan advances	15,000
Prospect [Member] \| Current senior debtor-in-possession lender [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Additional loan advances	$ 25,000