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Financial Instruments (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Interest Rate Cap [Member]
Jun. 30, 2012
Interest Rate Cap [Member]
Mar. 31, 2011
Senior Secured Credit Note [Member]
Jun. 30, 2012
Credit Concentration Risk [Member]
Jun. 30, 2011
Credit Concentration Risk [Member]
Jun. 30, 2012
Credit Concentration Risk [Member]
Rate
Jun. 30, 2011
Credit Concentration Risk [Member]
Dec. 31, 2011
Credit Concentration Risk [Member]
Jun. 30, 2012
Reverse Repurchase Agreement [Member]
Dec. 31, 2011
Reverse Repurchase Agreement [Member]
Jun. 30, 2012
Securities Borrowed Transactions [Member]
Dec. 31, 2011
Securities Borrowed Transactions [Member]
Jun. 30, 2012
U S Treasury Notes Securities [Member]
Contract
Jun. 30, 2012
Federal Fund [Member]
Contract
Jun. 30, 2012
Auction rate securities purchase commitment [Member]
Jun. 30, 2012
Auction rate securities purchase commitment [Member]
Jun. 30, 2012
Auction rate securities purchase commitment [Member]
Maximum [Member]
Jun. 30, 2012
Deferred Compensation Share Based Payments [Member]
Corporate equities liabilities [Member]
Dec. 31, 2011
Deferred Compensation Share Based Payments [Member]
Corporate equities liabilities [Member]
Jun. 30, 2012
Corporate [Member]
Jun. 30, 2012
Other than corporate customer [Member]
Mar. 31, 2011
Swaps [Member]
Jun. 30, 2012
Lehman brothers international Europe [Member]
Jun. 30, 2012
Two Major US Broker [Member]
Financial Instruments (Textual) [Abstract]                                                          
Securities Owned $ 1,100,644,000     $ 1,100,644,000 $ 924,541,000                                   $ 13,100,000 $ 13,200,000          
Company purchased and holds auction rate securities                                       77,700,000 77,700,000                
Securities purchases against purchase offers and legal settlement and proprietary position 77,900,000     77,900,000                                                  
Commitment to purchase ARS from clients through 2016                                       40,400,000 40,400,000                
Commitment to purchase ARS period maximum                                           2016              
Legal settlements with clients related ARS                                         77,700,000                
ARS held in proprietary trading account result of the failed auctions                                       150,000 150,000                
Valuation adjustment (unrealized loss) for ARS                                       5,700,000 5,700,000                
Assets and liabilities transferred from level one and level two                                       0                  
Loan position held in secondary loan trading portfolio 0     0 0                                                
Fair value of the reverse repurchase agreements 5,200,000     5,200,000                                                  
Fair value of the repurchase agreements 52,600,000     52,600,000                                                  
Senior secured credit note reference rate description               3-Month LIBOR                                          
Interest rate swap expiration date                                                     Mar. 31, 2011    
Maturity date of interest rate cap contract       2012-12-31                                                  
Forward or delayed delivery of the underlying instrument with settlement       180 days                                                  
Notional Value of purchase of to be announced securities 1,200,000     1,200,000                                                  
Notional Value of sale of to be announced securities 1,200,000     1,200,000                                                  
FHA loan commitments balance 421,500,000     421,500,000 326,700,000                                                
OMHHF had a loan receivable balance (included in other assets) 80,900,000     80,900,000 109,300,000                                                
Number of open short contract's                                   200                      
Open short contracts expiry period                                   10 years                      
Open contracts for Federal Funds futures                                     7,300,000,000                    
Open contracts for Federal Funds futures with a fair value                                   68,750 154,615                    
Net gain on the interest rate swaps, after tax      69,000                                                    
Ineffective portion of derivative included in income       0                                                  
Reclassified of other comprehensive income (loss) to other expenses   1,300,000                                                      
Outstanding letters of credit 0     0                                                  
Bank call loans 86,900,000     86,900,000 27,500,000                                                
Collateralized loans, collateralized by firm with market values                           206,400,000 209,900,000 5,700,000,000 5,500,000,000               95,700,000 208,100,000      
Customer securities under customer margin loans available to be pledged 1,200,000,000     1,200,000,000                                                  
Customer securities under customer margin loans agreement available to be repledged 269,800,000     269,800,000                   20,500,000 44,000,000 5,700,000 5,500,000                        
Customer securities deposited to secure obligations and margin requirements under option contracts 622,800,000     622,800,000                                                  
Gross balances of reverse repurchase agreements 5,700,000,000     5,700,000,000 5,500,000,000                                                
Gross balances of repurchase agreements 6,400,000,000     6,400,000,000 6,100,000,000                                                
Carrying value of pledged securities owned that can be sold or repledged by the counterparty 755,400,000     755,400,000 653,700,000                                                
Carrying value of securities owned by the Company loaned or pledged 152,600,000     152,600,000 119,800,000                                                
Lehman Brothers International (Europe) held securities with a fair value                                                       7,700,000  
Receivable from brokers and clearing organizations 294,444,000     294,444,000 288,113,000                                               138,500,000
Maximum aggregate principal amount of the warehouse facility                 1,500,000,000   1,500,000,000                                    
Utilization of warehouse facility                 61,200,000   61,200,000   65,900,000                                
Warehouse facility excess retention                                                             
Revolving credit facilities in leveraged financing transactions                 4,700,000   4,700,000                                    
Guaranteed mortgages for a period                 10 days   10 days                                    
Outstanding under the warehouse facility line                 54,000,000   54,000,000                                    
Variable interest rate under warehouse facility                     1 month LIBOR plus 2.15%                                    
Variable interest rate                     2.15%                                    
Interest expense           $ 573 $ 19,775   $ 235,000 $ 332,000 $ 700,000 $ 1,160,000