Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, Other Assets and Other Liabilities Disclosure [Abstract]
Accrued dividends payable	$ 106,816	$ 106,455
Accrued interest payable	63,991	80,263
Secured debt repayments pending servicer remittance	43,502	60,585
Accrued management and incentive fees payable	31,050	33,830
Current expected credit loss reserve for unfunded loan commitments	15,749	16,380
Derivative liabilities	13,550	119,665
Accounts payable and other liabilities	8,588	9,726
Total	$ 283,246	$ 426,904