Variable Interest Entities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Assets
Loans receivable	$ 24,896,364	$ 25,017,880
Current expected credit loss reserve	(336,591)	(326,137)	$ (122,221)	$ (124,679)
Loans receivable, net	24,559,773	24,691,743
Other assets	310,086	370,902
Total assets	25,385,667	25,353,985
Liabilities
Securitized debt obligations, net	2,664,208	2,664,010
Other liabilities	283,246	426,904
Total liabilities	20,824,968	20,809,785
VIE
Assets
Loans receivable	3,271,709	3,317,316
Current expected credit loss reserve	(95,114)	(93,396)
Loans receivable, net	3,176,595	3,223,920
Other assets	58,598	15,995
Total assets	3,235,193	3,239,915
Liabilities
Securitized debt obligations, net	2,664,208	2,664,010
Other liabilities	7,436	7,234
Total liabilities	$ 2,671,644	$ 2,671,244