Loans Receivable, Net - Net Book Value, Total Loan Exposure and Net Loan Exposure of Loans Receivable Based on Internal Risk Ratings (Detail) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) loan	Jun. 30, 2025 USD ($) security_loan	Dec. 31, 2024 USD ($) loan	Dec. 31, 2024 USD ($) security_loan	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans	144	144	130	130
Net book value	$ 19,706,105	$ 19,706,105	$ 19,047,518	$ 19,047,518
CECL reserve	(740,851)	(740,851)	(733,936)	(733,936)	$ (741,541)	$ (893,938)	$ (751,370)	$ (576,936)
Loans receivable, net	18,965,254	18,965,254	18,313,582	18,313,582
Net loan exposure	18,444,416	18,444,416	17,034,303	17,034,303
Cost-recovery proceeds	109,200	109,200	106,700	106,700
Loan participations sold	50,000	50,000	100,064	100,064
Junior Loan Participation
Financing Receivable, Credit Quality Indicator [Line Items]
Loan participations sold	50,000	50,000	100,064	100,064
Asset-specific debt, net
Financing Receivable, Credit Quality Indicator [Line Items]
Principal balance	$ 529,867	529,867	$ 1,228,110	1,228,110
1
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	8		11
Net book value	$ 476,141	476,141	$ 1,919,280	1,919,280
Net loan exposure	$ 475,273	475,273	$ 994,056	994,056
2
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	17		21
Net book value	$ 2,942,069	2,942,069	$ 3,346,881	3,346,881
Net loan exposure	$ 2,773,722	2,773,722	$ 3,349,347	3,349,347
3
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	87		65
Net book value	$ 11,908,048	11,908,048	$ 9,246,692	9,246,692
Net loan exposure	$ 11,477,440	11,477,440	$ 8,818,346	8,818,346
4
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	18		20
Net book value	$ 2,788,227	2,788,227	$ 2,707,104	2,707,104
Net loan exposure	$ 2,682,712	2,682,712	$ 2,622,877	2,622,877
5
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans | loan	14		13
Net book value	$ 1,591,620	1,591,620	$ 1,827,561	1,827,561
Net loan exposure	$ 1,035,269	$ 1,035,269	$ 1,249,677	$ 1,249,677