Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash and cash equivalents	$ 388,049		$ 323,483
Loans receivable	19,706,105		19,047,518
Current expected credit loss reserve	(740,851)	$ (741,541)	(733,936)	$ (893,938)	$ (751,370)	$ (576,936)
Loans receivable, net	18,965,254		18,313,582
Real estate owned, net	615,217		588,185
Other assets	507,834		572,253
Total Assets	20,584,441		19,801,955
Liabilities
Other liabilities	431,658		282,847
Total Liabilities	16,960,904		16,007,766
Securitized debt obligations, net
Liabilities
Securitized debt obligations, net	2,493,011		1,936,956
VIE
Assets
Cash and cash equivalents	16,188		9,145
Loans receivable	3,095,480		2,338,201
Current expected credit loss reserve	(154,384)		(202,400)
Loans receivable, net	2,941,096		2,135,801
Real estate owned, net	212,658		177,322
Other assets	127,188		126,518
Total Assets	3,297,130		2,448,786
Liabilities
Other liabilities	15,032		13,277
Total Liabilities	2,508,043		1,950,233
VIE | Securitized debt obligations, net
Liabilities
Securitized debt obligations, net	$ 2,493,011		$ 1,936,956