Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Principal Balance
Beginning balance	$ 25,160,343
Loan fundings	1,068,853
Loan repayments, sales, and cost-recovery proceeds	(2,280,034)
Unrealized (loss) gain on foreign currency translation	(99,665)
Ending balance	23,849,497
Deferred Fees / Other Items
Beginning balance	(142,463)
Loan repayments, sales, and cost-recovery proceeds	(40,733)
Unrealized (loss) gain on foreign currency translation	313
Deferred fees and other items	(11,046)
Amortization of fees and other items	60,333
Ending balance	(133,596)
Net Book Value
Beginning balance	25,017,880
Loan fundings	1,068,853
Loan repayments, sales, and cost-recovery proceeds	(2,320,767)
Unrealized (loss) gain on foreign currency translation	(99,352)
Deferred fees and other items	(11,046)
Amortization of fees and other items	60,333
Ending balance	23,715,901
CECL reserve	(463,423)	$ (363,875)	$ (336,591)	$ (326,137)	$ (144,431)	$ (133,024)	$ (122,221)	$ (124,679)
Loans receivable, net	$ 23,252,478			$ 24,691,743