Variable Interest Entities - Summary of Assets and Liabilities of Consolidated CLO and Single Asset Securitization VIE (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets:
Loans receivable	$ 22,003,017	$ 16,572,715	$ 16,164,801
Current expected credit loss reserve	(124,679)	(173,549)	$ 0
Loans receivable, net	21,878,338	16,399,166
Other assets	273,797	269,819
Total Assets	22,703,289	16,958,955
Liabilities:
Securitized debt obligations, net	2,838,062	2,922,499
Other liabilities	231,358	202,327
Total Liabilities	18,084,578	13,054,724
VIE
Assets:
Loans receivable	3,486,750	3,520,130
Current expected credit loss reserve	(4,502)	(13,454)
Loans receivable, net	3,482,248	3,506,676
Other assets	20,746	81,274
Total Assets	3,502,994	3,587,950
Liabilities:
Securitized debt obligations, net	2,838,062	2,922,499
Other liabilities	1,800	2,104
Total Liabilities	$ 2,839,862	$ 2,924,603