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Collateralized Transactions - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) broker-dealer | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) broker-dealer | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Bank call loans | $ 151,900,000 |  | $ 151,900,000 |  | $ 100,200,000
Customer securities under customer margin loans available to be pledged | 1,100,000,000 |  | 1,100,000,000 |  |
Customer securities under customer margin loans agreement available to be repledged | 96,300,000 |  | 96,300,000 |  |
Customer securities deposited to secure obligations and margin requirements under option contracts | 343,100,000 |  | 343,100,000 |  |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty | 657,500,000 |  | 657,500,000 |  | 546,300,000
Carrying value of securities owned by the Company loaned or pledged | $ 173,000,000 |  | $ 173,000,000 |  | 142,700,000
Receivable from brokers and clearing organizations, number of major broker-dealers | broker-dealer | 2 |  | 2 |  |
Receivable from brokers and clearing organizations | $ 107,900,000 |  | $ 107,900,000 |  |
Nonrecurring [Member] | Carrying Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Warehouse Agreement Borrowings | 1,486,000 |  | $ 1,486,000 |  | 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 | 159,000 | $ 385,000 | $ 359,000 | $ 510,000 |
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 | 26,200,000 |  | 26,200,000 |  | 36,000,000
Securities received as collateral under securities borrowed transaction with market value | 211,100,000 |  | 211,100,000 |  | 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 | 232,400,000 |  | 232,400,000 |  | 278,800,000
Securities received as collateral under securities borrowed transaction with market value | 232,400,000 |  | 232,400,000 |  | $ 278,800,000
Corporate [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Collateralized loans, collateralized by firm | 173,000,000 |  | 173,000,000 |  |
Other Than Corporate Customer [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Collateralized loans, collateralized by customer securities | $ 171,600,000 |  | $ 171,600,000 |  |

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