Other Expenses - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Management fees	$ 110,292	$ 88,467	$ 77,916
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 percentage	1.50%
Management incentive fee percentage	20.00%
Management core earnings fee percentage	7.00%
Management core earnings fee measurement period (in years)	3 years
Management core earnings fee minimum threshold	0.00%
Management fees	$ 73,000	64,200	60,400
Total incentive compensation payments	37,300	24,300	$ 17,500
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	$ 33,800	$ 28,400