Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Principal Balance
Beginning balance	$ 22,156,437
Loan fundings	2,924,418
Loan repayments and sales	(1,047,736)
Unrealized (loss) gain on foreign currency translation	(159,556)
Ending balance	23,873,563
Deferred Fees / Other Items
Beginning balance	(153,420)
Unrealized (loss) gain on foreign currency translation	1,165
Deferred fees and other items	(29,775)
Amortization of fees and other items	17,457
Ending balance	(164,573)
Net Book Value
Beginning balance	22,003,017
Loan fundings	2,924,418
Loan repayments and sales	(1,047,736)
Unrealized (loss) gain on foreign currency translation	(158,391)
Deferred fees and other items	(29,775)
Amortization of fees and other items	17,457
Ending balance	23,708,990
CECL reserve	(122,221)	$ (124,679)	$ (172,100)	$ (173,549)
Loans receivable, net	$ 23,586,769	$ 21,878,338