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Collateralized Transactions - Additional Information (Detail) (USD $) | 0 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Sep. 26, 2013 | Sep. 30, 2014 broker-dealer | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Credit Concentration Risk [Member] | Sep. 30, 2013 Credit Concentration Risk [Member] | Sep. 30, 2014 Credit Concentration Risk [Member] | Sep. 30, 2013 Credit Concentration Risk [Member] | Sep. 30, 2014 Warehouse Facility [Member] Credit Concentration Risk [Member] | Sep. 30, 2014 Reverse Repurchase Agreements [Member] | Dec. 31, 2013 Reverse Repurchase Agreements [Member] | Sep. 30, 2014 Securities Borrowed Transactions [Member] | Dec. 31, 2013 Securities Borrowed Transactions [Member] | Sep. 30, 2014 Corporate [Member] | Sep. 30, 2014 Other Than Corporate Customer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank call loans |  | $ 135,500,000 |  | $ 118,200,000 |  |  |  |  |  |  |  |  |  |  |
Collateralized loans, collateralized by firm |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,300,000 |
Collateralized loans, collateralized by customer securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148,900,000
Customer securities under customer margin loans available to be pledged |  | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Customer securities under customer margin loans agreement available to be repledged |  | 134,200,000 |  |  |  |  |  |  |  | 349,500,000 | 385,500,000 | 21,900,000 | 11,000,000 |  |
Customer securities deposited to secure obligations and margin requirements under option contracts |  | 360,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the reverse repurchase agreements |  | 250,000,000 |  | 184,000,000 |  |  |  |  |  |  |  |  |  |  |
Securities received as collateral under securities borrowed transaction with market value |  |  |  |  |  |  |  |  |  | 349,500,000 | 385,500,000 | 259,200,000 | 265,300,000 |  |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty |  | 498,900,000 |  | 586,600,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value of securities owned by the Company loaned or pledged |  | 127,900,000 |  | 126,800,000 |  |  |  |  |  |  |  |  |  |  |
Amount of first interim distribution | 9,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the company's investment on reserves not paid in first distribution |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |
Receivable from brokers and clearing organizations, number of major broker-dealers |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable from brokers and clearing organizations |  | 135,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed mortgages for a period |  |  |  |  |  |  | 15 days |  |  |  |  |  |  |  |
Outstanding under the warehouse facility line |  |  |  |  |  |  |  |  | 17,500,000 |  |  |  |  |  |
Variable interest rate under warehouse facility |  |  |  |  |  |  | 1 month LIBOR |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 181,000 | $ 183,000 | $ 400,000 | $ 616,000 |  |  |  |  |  |  |

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