Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities [Abstract]
Accrued dividends payable	$ 83,702	$ 76,530
Derivative liabilities	42,263	2,925
Accrued interest payable	24,831	25,588
Accrued management and incentive fees payable	20,159	18,586
Accounts payable and other liabilities	5,008	4,583
Total	$ 175,963	$ 128,212