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Fair Value Measurements - Additional Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 | $ 140,200 |
Securities owned, at fair value | $ 309,346 | $ 799,719
Forward or delayed delivery of the underlying instrument with settlement | 180 days |
Total amount of ARS the firm purchased and hold | $ 26,300 |
Auction Rate Securities Committed To Purchase related to settlements with regulators | 2,300 |
Auction Rate Securities Purchased as a result of Legal Settlements and Awards | 102,300 |
Auction Rate Securities Committed To Purchase as a Result of Legal Settlements and Awards | $ 3,700 |
ARS Securities Committed To Purchase Period | 2020 |
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 25,582 | 32,215
Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 26,336 | $ 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 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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