Real Estate and Other Activities - Prospect - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended			9 Months Ended
	Nov. 04, 2025	Aug. 04, 2025	May 31, 2023	Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Business Combination [Line Items]
Proceeds from sale of investments							$ 100,000
Investment in loans receivable							158,974	$ 392,241
Prospect [Member]
Business Combination [Line Items]
Recover of investments in Prospect				$ 660,000			660,000
Backstop facility claims		$ 30,000
Prospect [Member] | Subsequent Event [Member]
Business Combination [Line Items]
Proceeds from sale of investments	$ 45,000
Prospect [Member] | PHP Holdings [Member]
Business Combination [Line Items]
Asset backed loan outstanding			$ 75,000
Loan impairment charges						$ 400,000
Asset impairment charges				65,000	$ 110,000
Investment in loans receivable				$ 90,000			$ 100,000
Prospect [Member] | Income Valuation Approach [Member] | Level 3 [Member]
Business Combination [Line Items]
Market capitalization rate				8.50%
Prospect [Member] | Minimum [Member] | Income Valuation Approach [Member] | Level 3 [Member]
Business Combination [Line Items]
Market capitalization rate							8.25%
Prospect [Member] | Maximum [Member] | Income Valuation Approach [Member] | Level 3 [Member]
Business Combination [Line Items]
Market capitalization rate							8.50%