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Collateralized Transactions - Additional Information (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) dealer | Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Bank call loans |  | $ 118,300,000 | $ 145,800,000
Customer securities under customer margin loans available to be pledged |  | 1,200,000,000 |
Customer securities deposited to secure obligations and margin requirements under option contracts |  | 237,000,000 |
Outstanding letters of credit |  | 0 |
Gross Amounts of Recognized Liabilities |  |  | 378,084,000
Gross Amounts of Recognized Liabilities | [1] |  | 179,875,000
Amounts pledged |  | 655,683,000 | 438,385,000
Carrying value of securities owned by the Company loaned or pledged |  | $ 97,200,000 | 138,600,000
Number of broker-dealers | dealer |  | 4 |
Receivable from brokers and clearing organizations |  | $ 94,000,000 |
Reverse Repurchase Agreements |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities received as collateral under securities borrowed transaction with market value |  | 221,600,000 | 24,000,000
Securities Borrowed Transactions |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged |  | 30,900,000 | 37,400,000
Securities received as collateral under securities borrowed transaction with market value |  | 127,200,000 | 148,700,000
Repurchase Agreements [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged |  | 221,600,000 | $ 24,000,000
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 |  | 966,802,000 |
U.S. treasury, agency and sovereign obligations | Maturity Overnight and on Demand [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Gross Amounts of Recognized Liabilities |  | 786,532,000 |
Equity Securities [Member] | Maturity Overnight and on Demand [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Gross Amounts of Recognized Liabilities | [2] | $ 180,270,000 |
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 |
Commercial Banks |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Collateralized loans, collateralized by firm |  | $ 97,800,000 |
Customer securities under customer margin loans agreement available to be repledged |  | 198,300,000 |
Securities Loaned [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged |  | $ 139,200,000 |
[1] | Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.
[2] | Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.

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