Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Principal Balance
Beginning balance	$ 19,203,126
Loan fundings	3,440,030
Loan repayments, sales, and cost-recovery proceeds	(3,406,174)
Charge-offs	(114,678)
Transfer to real estate owned	(34,721)	$ (60,203)
Transfer to other assets, net	(11,298)
Payment-in-kind interest, net of interest received	8,450
Unrealized gain (loss) on foreign currency translation	789,605
Ending balance	19,874,340
Deferred Fees / Other Items
Beginning balance	(155,608)
Loan repayments, sales, and cost-recovery proceeds	(29,778)
Charge-offs	27,797
Unrealized gain (loss) on foreign currency translation	(2,610)
Deferred fees and other items	(34,874)
Amortization of fees and other items	26,838	33,700
Ending balance	(168,235)
Net Book Value
Beginning balance	19,047,518
Loan fundings	3,440,030
Loan repayments, sales, and cost-recovery proceeds	(3,435,952)
Charge-offs	(86,881)
Transfer to real estate owned	(34,721)	(60,203)
Transfer to other assets	(11,298)
Payment-in-kind interest	8,450
Unrealized gain (loss) on foreign currency translation	786,995
Deferred fees and other items	(34,874)
Amortization of fees and other items	26,838	33,700
Ending balance	19,706,105
CECL reserve	(740,851)	$ (893,938)	$ (741,541)	$ (733,936)	$ (751,370)	$ (576,936)
Loans receivable, net	$ 18,965,254			$ 18,313,582