Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Accrued dividends payable	$ 107,678	$ 107,390
Accrued interest payable	86,643	97,820
Secured debt repayments pending servicer remittance	24,240	13,526
Current expected credit loss reserves for unfunded loan commitments	12,644	15,371
Accounts payable and other liabilities	6,839	7,265
Derivative liabilities	990	94,817
Other liabilities	257,961	362,531
Related Party
Related Party Transaction [Line Items]
Accrued management and incentive fees payable	$ 18,927	$ 26,342