Loans Receivable, Net - Activity Relating to Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Principal Balance
Beginning balance	$ 16,652,824	$ 16,277,343
Loan fundings	12,550,463	1,896,276
Loan repayments and sales proceeds	(6,733,105)	(1,862,955)
Charge-offs of CECL reserve	(14,427)
Unrealized gain (loss) on foreign currency translation	(299,318)	342,160
Ending balance	22,156,437	16,652,824	$ 16,277,343
Deferred Fees/Other Items
Beginning balance	(80,109)	(112,542)
Unrealized gain (loss) on foreign currency translation	1,424	(1,900)
Deferred fees and other items	(143,002)	(21,946)
Amortization of fees and other items	68,267	56,279
Ending balance	(153,420)	(80,109)	(112,542)
Net Book Value
Beginning balance	16,572,715	16,164,801
Loan fundings	12,550,463	1,896,276
Loan repayments and sales proceeds	(6,733,105)	(1,862,955)
Principal charge-offs	(14,427)	0	0
Unrealized gain (loss) on foreign currency translation	(297,894)	340,260
Deferred fees and other items	(143,002)	(21,946)
Amortization of fees and other items	68,267	56,279
Ending balance	22,003,017	16,572,715	16,164,801
CECL reserve	(124,679)	(173,549)	$ 0
Loans receivable, net	21,878,338	16,399,166
Impaired loans
Principal Balance
Charge-offs of CECL reserve	(14,427)
Net Book Value
Beginning balance	337,197
Ending balance	$ 284,809	$ 337,197