Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, Other Assets and Other Liabilities Disclosure [Abstract]
Accrued dividends payable	$ 105,583	$ 104,271
Accrued interest payable	55,334	29,851
Accrued management and incentive fees payable	27,065	28,373
Secured debt repayments pending servicer remittance	22,117	47,664
Current expected credit loss reserve for unfunded loan commitments	8,434	6,263
Accounts payable and other liabilities	7,899	9,046
Derivative liabilities	2,589	5,890
Total	$ 229,021	$ 231,358