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Collateralized Transactions - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) broker-dealer | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Bank call loans | $ 148,300,000 |  | $ 100,200,000
Customer securities under customer margin loans available to be pledged | 1,100,000,000 |  |
Customer securities under customer margin loans agreement available to be repledged | 114,700,000 |  |
Customer securities deposited to secure obligations and margin requirements under option contracts | 360,700,000 |  |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty | 705,800,000 |  | 546,300,000
Carrying value of securities owned by the Company loaned or pledged | $ 163,700,000 |  | 142,700,000
Receivable from brokers and clearing organizations, number of major broker-dealers | broker-dealer | 4 |  |
Receivable from brokers and clearing organizations | $ 124,800,000 |  |
Nonrecurring [Member] | Carrying Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Warehouse Agreement Borrowings | $ 11,845,000 |  | 54,300,000
Minimum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Settlement with Financial Institution, Period to Complete Transactions | 1 day |  |
Maximum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Settlement with Financial Institution, Period to Complete Transactions | 3 days |  |
Credit Concentration Risk [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Guaranteed mortgages for a period | 15 days |  |
Variable interest rate under warehouse facility | one month LIBOR |  |
Interest expense | $ 200,000 | $ 125,000 |
Securities Borrowed Transactions [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged | 23,400,000 |  | 36,000,000
Securities received as collateral under securities borrowed transaction with market value | 185,900,000 |  | 217,000,000
Reverse Repurchase Agreements [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged | 320,800,000 |  | 278,800,000
Securities received as collateral under securities borrowed transaction with market value | 320,800,000 |  | $ 278,800,000
Corporate [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Collateralized loans, collateralized by firm | 163,500,000 |  |
Other Than Corporate Customer [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Collateralized loans, collateralized by customer securities | $ 230,600,000 |  |

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