Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Other Assets And Liabilities Disclosure [Abstract]
Other real estate liabilities	$ 85,363	$ 72,018
Accrued dividends payable	80,644	81,214	$ 107,678
Derivative liabilities	68,158	5,238
Accrued interest payable	65,294	77,855
Accrued management and incentive fees payable	17,235	18,534
Accounts payable and other liabilities	12,787	13,834
Current expected credit loss reserves for unfunded loan commitments	10,487	10,412	$ 12,600
Secured debt repayments pending servicer remittance	1,309	3,742
Other liabilities	$ 341,277	$ 282,847