Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Deferred tax asset related to investments	$ 278,200,000	$ 148,900,000
Additions to deferred tax asset	324,400,000	177,200,000
Deferred tax asset related to U.S. federal net operating loss carryforwards	38,300,000
Deferred tax asset related to U.S. state net operating loss carryforwards	$ 7,900,000
Operating loss carryforward expiration year	2029
Unrecognized tax benefits	$ 0
Class A Shares
Operating Loss Carryforwards [Line Items]
Additions to deferred tax asset	$ 185,100,000	$ 86,400,000	$ 89,000,000