v3.26.1
Variable Interest Entities - Summary of Investment in Senior and Subordinate MBS Backed by Assets Held in Consolidated VIEs (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]      
Loans held for investment $ (65,803) $ 28,681  
Asset-backed financings of variable interest entities at fair value 62,236 (29,423)  
Interest income 276,091 176,091  
Net investment income 82,134 44,465  
Loans held for investment at fair value 10,867,942   $ 8,532,644
Asset-backed financings at fair value 9,903,515   7,789,303
Variable Interest Entities [Member]      
Variable Interest Entity [Line Items]      
Loans held for investment at fair value 10,866,292   8,530,939
Asset-backed financings at fair value 9,903,515   7,789,303
Variable Interest Entities [Member] | Subordinate Mortgage Backed Securities [Member]      
Variable Interest Entity [Line Items]      
Loans held for investment (65,803) 28,712  
Asset-backed financings of variable interest entities at fair value 62,236 (29,423)  
Interest income 133,754 33,673  
Interest expense 120,540 28,715  
Net investment income 9,647 $ 4,247  
Loans held for investment at fair value 10,866,292   8,530,939
Asset-backed financings at fair value 9,903,515   7,789,303
Retained interests at fair value pledged to secure Assets sold under agreements to repurchase $ 937,680   $ 648,159