v3.26.3
Variable Interest Entities - Summary of Investment in MBS Backed by Assets Held in Consolidated VIEs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
Loans held for investment $ (531,924) $ 48,480 $ (626,215) $ 90,820  
Asset-backed financings of variable interest entities at fair value 526,604 (35,707) 629,492 (79,923)  
Interest income 314,402 230,088 894,743 602,660  
Net investment income 36,244 99,232 191,107 213,898  
Loans held for investment at fair value 14,401,385   14,401,385   $ 8,532,644
Asset-backed financings at fair value 13,146,200   13,146,200   7,789,303
Variable Interest Entities [Member]          
Variable Interest Entity [Line Items]          
Loans held for investment at fair value 14,400,024   14,400,024   8,530,939
Asset-backed financings at fair value 13,146,200   13,146,200   7,789,303
Variable Interest Entities [Member] | Mortgage Backed Securities [Member]          
Variable Interest Entity [Line Items]          
Loans held for investment (531,871) 48,488 (626,119) 90,800  
Asset-backed financings of variable interest entities at fair value 526,604 (35,707) 629,492 (79,923)  
Interest income 186,210 67,153 480,535 151,513  
Interest expense 202,989 65,409 479,383 140,573  
Net investment income (22,046) $ 14,525 4,525 $ 21,817  
Loans held for investment at fair value 14,400,024   14,400,024   8,530,939
Asset-backed financings at fair value 13,146,200   13,146,200   7,789,303
Retained interests at fair value pledged to secure Assets sold under agreements to repurchase $ 1,214,056   $ 1,214,056   $ 648,159