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Collateralized Transactions - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 12 Months Ended
Sep. 26, 2013
Dec. 31, 2013
Dealer
Dec. 31, 2012
Dec. 31, 2013
Credit Concentration Risk [Member]
Dec. 31, 2012
Credit Concentration Risk [Member]
Dec. 31, 2011
Credit Concentration Risk [Member]
Dec. 31, 2013
Warehouse Facility [Member]
Credit Concentration Risk [Member]
Dec. 31, 2013
Reverse Repurchase Agreements [Member]
Dec. 31, 2012
Reverse Repurchase Agreements [Member]
Dec. 31, 2013
Securities Borrowed Transactions [Member]
Dec. 31, 2012
Securities Borrowed Transactions [Member]
Dec. 31, 2013
Corporate [Member]
Dec. 31, 2013
Other Than Corporate Customer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                          
Bank call loans   $ 118,200,000 $ 128,300,000                    
Collateralized loans, collateralized by firm                       126,400,000  
Collateralized loans, collateralized by customer securities                         230,600,000
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   189,800,000           385,500,000 1,200,000,000 11,000,000 14,300,000    
Customer securities deposited to secure obligations and margin requirements under option contracts   345,700,000                      
Outstanding letters of credit   0                      
Fair value of the reverse repurchase agreements   184,000,000                      
Fair value of the repurchase agreements   0                      
Securities received as collateral under securities borrowed transaction with market value               385,500,000 1,200,000,000 265,300,000 354,000,000    
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty   586,600,000 570,000,000                    
Carrying value of securities owned by the Company loaned or pledged   126,800,000 159,400,000                    
Amount of first interim distribution 9,500,000                        
Fair value of the company's investment on reserves not paid in first distribution   274,400                      
Receivable from brokers and clearing organizations   162,100,000                      
Number of broker-dealers   3                      
Loans to Citizens   0                      
Guaranteed mortgages for a period       15 days                  
Outstanding under the warehouse facility line             54,600,000            
Variable interest rate under warehouse facility       1 month LIBOR                  
Interest expense       $ 764,500 $ 895,000 $ 1,700,000