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Fair Value Measurements - Additional Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction Rate Securities Purchased as a Result of Settlements with Regulators | $ 143,400 |
Securities owned, at fair value | $ 605,330 | $ 610,517
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 | 435 |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 605,330 | 610,517
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | 104,594 | 94,750
Other Investments | 4,400 |
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | 41,364 | 36,554
Auction rate securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | 31,470 | 30,701
Auction rate securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities owned, at fair value | $ 0 | $ 0
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 remaining to purchase from Eligible Investors related to the Settlements with the Regulators + References No definition available. + Details
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- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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