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Collateralized Transactions - Additional Information (Narrative) (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) dealer | Dec. 31, 2017 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 705,491,000 | $ 786,532,000
Gross Amounts of Recognized Liabilities | 197,332,000 | 180,270,000
Bank call loans | 3,000,000 | 118,300,000
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value | 1,100,000,000 |
Customer securities under customer margin loans agreement available to be repledged | 169,900,000 |
Outstanding letters of credit | 0 |
Amounts pledged | 738,835,000 | 655,683,000
Carrying value of securities owned by the Company loaned or pledged | $ 3,300,000 | 97,200,000
Number of broker-dealers | dealer | 5 |
Receivable from brokers and clearing organizations | $ 84,300,000 |
Securities Sold under Agreements to Repurchase, Asset | 99,481,000 | 200,054,000
Securities Sold under Agreements to Repurchase, Amount Not Offset Against Collateral | 606,010,000 | 586,478,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 603,961,000 | 585,289,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | 0 | 0
Securities Sold under Agreements to Repurchase, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 2,049,000 | 1,189,000
Securities Loaned, Asset | 0 | 0
Securities Loaned, Amount Not Offset Against Collateral | 197,332,000 | 180,270,000
Securities Loaned, Collateral, Right to Reclaim Securities | 189,961,000 | 170,176,000
Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 7,371,000 | 10,094,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross | 902,823,000 | 966,802,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset | 99,481,000 | 200,054,000
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Amount Not Offset Against Collateral | 803,342,000 | 766,748,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities | 793,922,000 | 755,465,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 9,420,000 | 11,283,000
Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 100,600,000 | 221,600,000
Securities Loaned [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 18,100,000 | 30,900,000
Repurchase Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 100,600,000 | 221,600,000
Securities Borrowed Transactions |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 110,700,000 | $ 127,200,000
Maturity Overnight and on Demand [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 902,823,000 |
Short-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateralized loans, collateralized by firm | 3,300,000 |
Collateralized loans, collateralized by customer securities | $ 311,800,000 |
Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of business days for related transactions | 1 day |
Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of business days for related transactions | 2 days |
Options Clearing Corporation [Domain] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | $ 287,000,000 |

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