Variable Interest Entities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Assets
Loans receivable	$ 23,189,312	$ 23,787,012
Current expected credit loss reserve	(751,370)	(576,936)	$ (336,591)	$ (326,137)
Loans receivable, net	22,437,942	23,210,076
Other assets	353,732	476,088
Total assets	23,265,863	24,036,178
Liabilities
Securitized debt obligations, net	2,328,073	2,505,417
Other liabilities	257,961	362,531
Total liabilities	19,101,276	19,648,674
VIE
Assets
Loans receivable	2,973,831	3,061,278
Current expected credit loss reserve	(168,521)	(183,508)
Loans receivable, net	2,805,310	2,877,770
Other assets	13,462	103,692
Total assets	2,818,772	2,981,462
Liabilities
Securitized debt obligations, net	2,328,073	2,505,417
Other liabilities	7,518	8,101
Total liabilities	$ 2,335,591	$ 2,513,518