Commitments and Contingencies - Additional Information (Detail) - DST Systems Inc [Member] - USD ($)				12 Months Ended
	Aug. 03, 2023	Jul. 14, 2023	Jul. 10, 2020	Dec. 31, 2023	Oct. 25, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Accrued liability and expense				$ 3,000,000	$ 55,100,000
Litigation settlement, expense	$ 55,100,000
Accrued Liabilities Scheduled Payment				52,100,000
Future Accrued Liabilities Scheduled Payment				3,000,000
Other (expense) income [Member]
Loss Contingencies [Line Items]
Accrued liability and expense						$ 8,100,000	$ 43,400,000
Litigation settlement, expense				$ 3,600,000
Settled Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement, expense		$ 124,625,000
Settled Litigation [Member] | Putative Claims [Member]
Loss Contingencies [Line Items]
Litigation settlement, expense			$ 27,000,000