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Collateralized Transactions - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 3 Months Ended
Sep. 26, 2013
Mar. 31, 2014
Dealer
Dec. 31, 2013
Mar. 31, 2014
Credit Concentration Risk [Member]
Mar. 31, 2013
Credit Concentration Risk [Member]
Mar. 31, 2014
Warehouse Facility [Member]
Credit Concentration Risk [Member]
Mar. 31, 2014
Reverse Repurchase Agreements [Member]
Dec. 31, 2013
Reverse Repurchase Agreements [Member]
Mar. 31, 2014
Securities Borrowed Transactions [Member]
Dec. 31, 2013
Securities Borrowed Transactions [Member]
Mar. 31, 2014
Corporate [Member]
Mar. 31, 2014
Other Than Corporate Customer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Bank call loans   $ 197,000,000 $ 118,200,000                  
Collateralized loans, collateralized by firm                     105,000,000  
Collateralized loans, collateralized by customer securities                       234,000,000
Customer securities under customer margin loans available to be pledged   1,400,000,000                    
Customer securities under customer margin loans agreement available to be repledged   187,800,000         346,300,000 385,500,000 15,200,000 11,000,000    
Customer securities deposited to secure obligations and margin requirements under option contracts   323,400,000                    
Outstanding letters of credit   0                    
Fair value of the reverse repurchase agreements   250,000,000 184,000,000                  
Fair value of the repurchase agreements                         
Securities received as collateral under securities borrowed transaction with market value             346,300,000 385,500,000 227,000,000 265,300,000    
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty   483,300,000 586,600,000                  
Carrying value of securities owned by the Company loaned or pledged   105,700,000 126,800,000                  
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   123,400,000                    
Number of broker-dealers   3                    
Loans to citizens   0                    
Guaranteed mortgages for a period       15 days                
Outstanding under the warehouse facility line           2,400,000            
Variable interest rate under warehouse facility       1 month LIBOR                
Interest expense       $ 144,000 $ 142,000