Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Other Assets And Liabilities Disclosure [Abstract]
Other real estate liabilities	$ 80,818	$ 72,018
Accrued dividends payable	80,649	81,214	$ 107,664
Derivative liabilities	95,700	5,238
Accrued interest payable	80,024	77,855
Debt repayments pending servicer remittance	48,902	3,742
Accrued management and incentive fees payable	17,036	18,534
Accounts payable and other liabilities	16,816	13,834
Current expected credit loss reserves for unfunded loan commitments	11,713	10,412	$ 9,900
Other liabilities	$ 431,658	$ 282,847