Loans Receivable, Net - Net Book Value, Total Loan Exposure and Net Loan Exposure of Loans Receivable Based on Internal Risk Ratings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) loan	Dec. 31, 2024 USD ($) security_loan	Dec. 31, 2023 USD ($) loan	Dec. 31, 2023 USD ($) security_loan	Dec. 31, 2022 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans	130	130	178	178
Net book value	$ 19,047,518	$ 19,047,518	$ 23,787,012	$ 23,787,012	$ 25,017,880
CECL reserve	(733,936)	(733,936)	(576,936)	(576,936)	(326,137)
Loans receivable, net	18,313,582	18,313,582	23,210,076	23,210,076
Total loan exposure	19,920,539	19,920,539	24,971,028	24,971,028
Net loan exposure	17,034,303	17,034,303	21,951,988	21,951,988
Principal balance	19,203,126	19,203,126	23,923,719	23,923,719	$ 25,160,343
Total loan exposure including non-consolidated senior interests	817,500	817,500	1,100,000	1,100,000
Loan participations sold	100,064	100,064	337,721	337,721
Cost-recovery proceeds	106,700	106,700	53,000	53,000
Junior Loan Participation
Financing Receivable, Credit Quality Indicator [Line Items]
Loan participations sold	100,064	100,064	100,924	100,924
Senior Participations
Financing Receivable, Credit Quality Indicator [Line Items]
Loan participations sold			236,797	236,797
Asset-specific debt, net
Financing Receivable, Credit Quality Indicator [Line Items]
Securitized debt obligations, net	$ 1,224,841	1,224,841	$ 1,000,210	1,000,210
1
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	11		15
Net book value	$ 1,919,280	1,919,280	$ 763,101	763,101
Total loan exposure	1,921,416	1,921,416	811,217	811,217
Net loan exposure	$ 994,056	994,056	$ 763,223	763,223
2
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	21		36
Net book value	$ 3,346,881	3,346,881	$ 6,143,184	6,143,184
Total loan exposure	3,354,857	3,354,857	6,618,319	6,618,319
Net loan exposure	$ 3,349,347	3,349,347	$ 5,095,395	5,095,395
3
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	65		99
Net book value	$ 9,246,692	9,246,692	$ 12,277,518	12,277,518
Total loan exposure	9,462,122	9,462,122	12,573,282	12,573,282
Net loan exposure	$ 8,818,346	8,818,346	$ 11,964,620	11,964,620
4
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	20		15
Net book value	$ 2,707,104	2,707,104	$ 2,725,930	2,725,930
Total loan exposure	3,245,102	3,245,102	3,036,837	3,036,837
Net loan exposure	$ 2,622,877	2,622,877	$ 2,668,025	2,668,025
5
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	13		13
Net book value	$ 1,827,561	1,827,561	$ 1,877,279	1,877,279
Total loan exposure	1,937,042	1,937,042	1,931,373	1,931,373
Net loan exposure	$ 1,249,677	$ 1,249,677	$ 1,460,725	$ 1,460,725