Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, Other Assets and Other Liabilities Disclosure [Abstract]
Accrued dividends payable	$ 104,271	$ 91,004
Secured debt repayments pending servicer remittance	47,664	0
Accrued interest payable	29,851	20,548
Accrued management and incentive fees payable	28,373	19,158
Accounts payable and other liabilities	9,046	2,671
Derivative liabilities	5,890	58,915
CECL reserve	6,263	10,031
Total	$ 231,358	$ 202,327