Variable Interest Entities (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Assets
Loans receivable	$ 24,482,749		$ 25,017,880
Current expected credit loss reserve	(363,875)	$ (336,591)	(326,137)	$ (133,024)	$ (122,221)	$ (124,679)
Loans receivable, net	24,118,874		24,691,743
Other assets	260,906		370,902
Total assets	24,862,636		25,353,985
Liabilities
Securitized debt obligations, net	2,666,414		2,664,010
Other liabilities	294,007		426,904
Total liabilities	20,296,447		20,809,785
VIE
Assets
Loans receivable	3,316,109		3,317,316
Current expected credit loss reserve	(112,999)		(93,396)
Loans receivable, net	3,203,110		3,223,920
Other assets	14,946		15,995
Total assets	3,218,056		3,239,915
Liabilities
Securitized debt obligations, net	2,666,414		2,664,010
Other liabilities	7,314		7,234
Total liabilities	$ 2,673,728		$ 2,671,244