Debt and Preferred Equity Investments - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) investment	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) investment segment	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) segment investment
Preferred equity investment
Number of investments, nonperforming | investment	2		2		2
Debt and preferred equity investments	$ 293,924,000		$ 293,924,000		$ 346,745,000
Recorded investment, past due	293,924,000		$ 293,924,000		$ 346,745,000
Number of portfolio segments of financial receivables (segment) | segment			1		1
Current period provision for loan loss	0	$ 0	$ 0	$ 6,890,000	$ 6,890,000
Other Assets
Preferred equity investment
Current period provision for loan loss			0	$ 0
Other Assets
Preferred equity investment
Additional amount of financing receivables included in other assets	10,900,000		10,900,000		8,800,000
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0		0		0
Three Mortgage Investments
Preferred equity investment
Debt and preferred equity investments	49,800,000		49,800,000
Floating Rate
Preferred equity investment
Debt and preferred equity investments	$ 109,604,000		$ 109,604,000		168,899,000
Floating Rate | Mortgage Investment One
Preferred equity investment
Debt and preferred equity investments					$ 49,800,000