Variable Interest Entities - Summary of Assets and Liabilities of Consolidated VIE (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Loans receivable	$ 25,017,880	$ 22,003,017	$ 16,572,715
Current expected credit loss reserve	(326,137)	(124,679)	$ (173,549)
Loans receivable, net	24,691,743	21,878,338
Other assets	370,902	273,797
Total assets	25,353,985	22,703,289
Liabilities
Securitized debt obligations, net	2,664,010	2,838,062
Other liabilities	426,904	231,358
Total liabilities	20,809,785	18,084,578
VIE
Assets
Loans receivable	3,317,316	3,486,750
Current expected credit loss reserve	(93,396)	(4,502)
Loans receivable, net	3,223,920	3,482,248
Other assets	15,995	20,746
Total assets	3,239,915	3,502,994
Liabilities
Securitized debt obligations, net	2,664,010	2,838,062
Other liabilities	7,234	1,800
Total liabilities	$ 2,671,244	$ 2,839,862