Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Principal Balance
Beginning balance	$ 19,203,126
Loan fundings	1,677,727
Loan repayments, sales, and cost-recovery proceeds	(1,810,678)
Charge-offs	(50,384)
Transfer to real estate owned	(34,721)	$ (60,203)
Transfer to other assets, net	(10,323)
Payment-in-kind interest, net of interest received	3,570
Unrealized gain (loss) on foreign currency translation	239,451
Ending balance	19,217,768
Deferred Fees / Other Items
Beginning balance	(155,608)
Loan repayments, sales, and cost-recovery proceeds	(18,923)
Charge-offs	8,560
Unrealized gain (loss) on foreign currency translation	(742)
Deferred fees and other items	(11,965)
Amortization of fees and other items	10,622	16,433
Ending balance	(168,056)
Net Book Value
Beginning balance	19,047,518
Loan fundings	1,677,727
Loan repayments, sales, and cost-recovery proceeds	(1,829,601)
Charge-offs	(41,824)
Transfer to real estate owned	(34,721)	(60,203)
Transfer to other assets	(10,323)
Payment-in-kind interest	3,570
Unrealized gain (loss) on foreign currency translation	238,709
Deferred fees and other items	(11,965)
Amortization of fees and other items	10,622	16,433
Ending balance	19,049,712
CECL reserve	(741,541)	$ (751,370)	$ (733,936)	$ (576,936)
Loans receivable, net	$ 18,308,171		$ 18,313,582