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Fair Value Measurements - Additional Information (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction Rate Securities Purchased as a Result of Settlements with Regulators | $ 142,500 |
Securities owned, at fair value | $ 646,680 | $ 799,719
Forward or delayed delivery of the underlying instrument with settlement | 180 days |
Auction Rate Securities Purchased as a result of Legal Settlements and Awards | $ 106,100 |
Auction Rate Securities remaining to purchase from Eligible Investors related to the settlements with the Regulators | 1,300 |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 646,680 | 799,719
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | 32,121 | 32,215
Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 30,701 | $ 25,314
Hedge Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment Redemption Notice Period Minimum | 30 days |
Investment Redemption Notice Period Maximum | 120 days |

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- Definition Auction Rate Securities Purchased as a Result of Settlements with Regulators Inception to Date + References No definition available. + Details
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- Definition Auction Rate Securities Purchased as a result of Legal Settlements and Awards Inception to Date + References No definition available. + Details
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- Definition Auction Rate Securities remaining to purchase from Eligible Investors related to the Settlements with the Regulators + References No definition available. + Details
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- Definition Maximum settlement period in case of delayed delivery of underlying instrument. + References No definition available. + Details
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- Definition Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned + References No definition available. + Details
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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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- 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 + Details
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