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Fair Value Measurements - Additional Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jun. 23, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Auction Rate Securities Valuation Adjustment | $ 5,200 |  |
Auction Rate Securities Purchased as a Result of Settlements with Regulators | 142,500 |  |
Auction Rate Securities Committed To Purchase related to settlements with regulators | 1,300 |  |
Auction Rate Securities Purchased as a result of Legal Settlements and Awards | 106,100 |  |
Securities owned, at fair value | $ 610,517 | $ 799,719 |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |  |
Auction Rate Securities Purchased And Hold | $ 30,700 |  |
Other Investments | 4,200 |  |
Equity Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, at fair value | 36,554 | 32,215 |
Auction rate securities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, at fair value | 30,701 | 25,314 |
Auction Rate Securities Owned |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
ARS Valuation Adjustment For Level Two and Three Assets | 5,000 |  |
Auction rate securities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | $ 29,566 | (21,350) |
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 |  |
Auction Rate Securities Purchase Commitment |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | $ 332 |  |
Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, at fair value | 94,750 |  |
Level 2 | Auction rate securities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, at fair value | 0 | $ 25,314 |
6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest rate |  |  | 6.75%
Auction Rate Securities Purchase Commitment |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Auction Rate Securities Valuation Adjustment | $ 200 |  |

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