Collateralized Transactions (Detail) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Broker-Dealer [Abstract]
Repurchase agreements	$ 0	$ 0
Reverse repurchase agreements	$ 0	$ 0

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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