Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accrued dividends payable	$ 83,920	$ 83,702
Accrued interest payable	27,549	24,831
Current expected credit loss reserve for unfunded loan commitments	112,694	112,694
Accrued management and incentive fees payable	19,277	20,159
Accounts payable and other liabilities	6,453	5,008
Derivative liabilities	1	42,263
Total	159,736	$ 175,963
Unfunded Loan Commitments [Member]
Current expected credit loss reserve for unfunded loan commitments	$ 22,536		$ 0