Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Principal Balance
Beginning balance	$ 22,156,437
Loan fundings	6,210,880
Loan repayments and sales	(2,520,175)
Unrealized (loss) gain on foreign currency translation	(1,270,541)
Ending balance	24,576,601
Deferred Fees / Other Items
Beginning balance	(153,420)
Unrealized (loss) gain on foreign currency translation	9,733
Deferred fees and other items	(67,950)
Amortization of fees and other items	58,169
Ending balance	(153,468)
Net Book Value
Beginning balance	22,003,017
Loan fundings	6,210,880
Loan repayments and sales	(2,520,175)
Unrealized (loss) gain on foreign currency translation	(1,260,808)
Deferred fees and other items	(67,950)
Amortization of fees and other items	58,169
Ending balance	24,423,133
CECL reserve	(144,431)	$ (133,024)	$ (122,221)	$ (124,679)	$ (130,388)	$ (128,945)	$ (172,100)	$ (173,549)
Loans receivable, net	$ 24,278,702			$ 21,878,338