Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, Other Assets and Other Liabilities Disclosure [Abstract]
Accrued dividends payable	$ 105,576	$ 104,271
Accrued interest payable	37,479	29,851
Accrued management and incentive fees payable	23,486	28,373
Accounts payable and other liabilities	11,005	9,046
Current expected credit loss reserve for unfunded loan commitments	6,254	6,263
Derivative liabilities	6,241	5,890
Secured debt repayments pending servicer remittance	271	47,664
Total	$ 190,312	$ 231,358