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Collateralized Transactions - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 26, 2013 USD ($) | Sep. 30, 2015 USD ($) broker-dealer | Sep. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) broker-dealer | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Bank call loans |  | $ 147,700,000 |  |  | $ 147,700,000 |  | $ 59,400,000
Customer securities under customer margin loans available to be pledged |  | 1,400,000,000 |  |  | 1,400,000,000 |  |
Customer securities under customer margin loans agreement available to be repledged |  | 150,000,000 |  |  | 150,000,000 |  |
Customer securities deposited to secure obligations and margin requirements under option contracts |  | 741,900,000 |  |  | 741,900,000 |  |
Outstanding letters of credit |  | 0 |  |  | 0 |  |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty |  | 752,800,000 |  |  | 752,800,000 |  | 518,100,000
Carrying value of securities owned by the Company loaned or pledged |  | 216,600,000 |  |  | $ 216,600,000 |  | 149,100,000
Amount of first interim distribution | $ 9,500,000 | $ 437,000 |  | $ 600,000 |  |  |
Receivable from brokers and clearing organizations, number of major broker-dealers | broker-dealer |  | 2 |  |  | 2 |  |
Receivable from brokers and clearing organizations |  | $ 147,500,000 |  |  | $ 147,500,000 |  |
Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Fair value estimate not practicable warehouse payable |  | 30,856,000 |  |  | 30,856,000 |  | 16,683,000
Nonrecurring [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Fair value estimate not practicable warehouse payable |  | 30,856,000 |  |  | $ 30,856,000 |  | 16,683,000
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 |  |  |  |  | 1 month LIBOR |  |
Interest expense |  | 280,000 | $ 181,000 |  | $ 790,000 | $ 400,000 |
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 |  | 55,300,000 |  |  | 55,300,000 |  | 4,400,000
Securities received as collateral under securities borrowed transaction with market value |  | 290,600,000 |  |  | 290,600,000 |  | 235,100,000
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 |  | 404,700,000 |  |  | 404,700,000 |  | 314,100,000
Securities received as collateral under securities borrowed transaction with market value |  | 404,700,000 |  |  | 404,700,000 |  | $ 312,600,000
Corporate [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Collateralized loans, collateralized by firm |  | 216,100,000 |  |  | 216,100,000 |  |
Other Than Corporate Customer [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Collateralized loans, collateralized by customer securities |  | $ 335,400,000 |  |  | $ 335,400,000 |  |

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