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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
Loans held for investment $ (28,488) $ 13,659 $ (94,291) $ 42,340  
Asset-backed financings of variable interest entities at fair value 40,652 (14,793) 102,888 (44,216)  
Interest income 304,250 196,481 580,341 372,572  
Net investment income 72,729 70,201 154,863 114,666  
Loans held for investment at fair value 12,458,249   12,458,249   $ 8,532,644
Asset-backed financings at fair value 11,358,602   11,358,602   7,789,303
Variable Interest Entities [Member]          
Variable Interest Entity [Line Items]          
Loans held for investment at fair value 12,456,657   12,456,657   8,530,939
Asset-backed financings at fair value 11,358,602   11,358,602   7,789,303
Variable Interest Entities [Member] | Subordinate Mortgage Backed Securities [Member]          
Variable Interest Entity [Line Items]          
Loans held for investment (28,484) 13,600 (94,248) 42,312  
Asset-backed financings of variable interest entities at fair value 40,652 (14,793) 102,888 (44,216)  
Interest income 160,571 50,687 294,325 84,360  
Interest expense 155,854 46,449 276,394 75,164  
Net investment income 16,885 $ 3,045 26,571 $ 7,292  
Loans held for investment at fair value 12,456,657   12,456,657   8,530,939
Asset-backed financings at fair value 11,358,602   11,358,602   7,789,303
Retained interests at fair value pledged to secure Assets sold under agreements to repurchase $ 1,077,164   $ 1,077,164   $ 648,159