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Securities Owned - Schedule of Securities Owned/Sold But Not Yet Purchased (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Security Owned and Sold Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	$ 127,166	$ 34,895
Trading Securities [Member]
Security Owned and Sold Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	$ 127,166	$ 34,895

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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