Other Expenses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Management fees		$ 88,467	$ 77,916	$ 78,435
Shares issued for management and incentive fees (in shares)	840,696
Shares issued for management and incentive fees	$ 19,300
Manager
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Management base fee		1.50%
Management incentive fee		20.00%
Management core earnings fee		7.00%
Management core earnings fee measurement period		3 years
Management core earnings fee minimum threshold		0.00%
Management fees		$ 64,200	60,400	55,300
Total incentive compensation payments		24,300	$ 17,500	$ 23,200
Shares issued for management and incentive fees (in shares)			840,696
Shares issued for management and incentive fees			$ 19,300
Accrued management and incentive fees payable		$ 28,400	$ 19,200