Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Principal Balance
Beginning balance	$ 23,923,719
Loan fundings	982,229
Loan repayments, sales, and cost-recovery proceeds	(3,055,044)
Charge-offs	(104,157)
Transfer to real estate owned	(139,239)	$ 0
Transfer to other assets	(30,177)
Payment-in-kind interest, net of interest received	9,612
Unrealized gain (loss) on foreign currency translation	174,741
Ending balance	21,761,684
Deferred Fees / Other Items
Beginning balance	(136,707)
Loan repayments, sales, and cost-recovery proceeds	(59,848)
Charge-offs	13,618
Unrealized gain (loss) on foreign currency translation	(658)
Deferred fees and other items	(26,140)
Amortization of fees and other items	50,568	60,333
Ending balance	(159,167)
Net Book Value
Beginning balance	23,787,012
Loan fundings	982,229
Loan repayments, sales, and cost-recovery proceeds	(3,114,892)
Charge-offs	(90,539)
Transfer to real estate owned	(139,239)	0
Transfer to other assets	(30,177)
Payment-in-kind interest, net of interest received	9,612
Unrealized gain (loss) on foreign currency translation	174,083
Deferred fees and other items	(26,140)
Amortization of fees and other items	50,568	60,333
Ending balance	21,602,517
CECL reserve	(1,011,059)	$ (463,423)	$ (893,938)	$ (751,370)	$ (576,936)	$ (363,875)	$ (336,591)	$ (326,137)
Loans receivable, net	$ 20,591,458				$ 23,210,076