Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Disaggregation of Revenue (Details)

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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Commissions $ 172,108 $ 131,467 $ 515,775 $ 394,492
Investment banking 9,982 14,745 38,201 34,121
Principal transactions 45 107 445 685
Interest and dividends 1,434 629 3,301 1,921
Service fees 28,702 19,277 81,189 58,169
Other income 12,054 9,407 35,533 26,426
Total revenues 348,875 322,309 1,036,015 924,136
Corporate        
Disaggregation of Revenue [Line Items]        
Commissions 0   0  
Investment banking (185)   (854)  
Principal transactions (1)   7  
Interest and dividends 549   1,027  
Service fees 199   587  
Other income 100   2,506  
Total revenues 720 327 3,441 942
Advisory fees        
Disaggregation of Revenue [Line Items]        
Advisory fees 124,550 146,677 361,571 408,322
Advisory fees | Corporate        
Disaggregation of Revenue [Line Items]        
Advisory fees 58   168  
Independent Advisory and Brokerage Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Commissions 137,054   407,159  
Investment banking 129   558  
Principal transactions (2)   5  
Interest and dividends 700   1,854  
Service fees 27,868   78,780  
Other income 11,418   30,608  
Total revenues 300,015 286,170 875,015 832,866
Independent Advisory and Brokerage Services | Advisory fees | Operating Segments        
Disaggregation of Revenue [Line Items]        
Advisory fees 122,848   356,051  
Ladenburg | Operating Segments        
Disaggregation of Revenue [Line Items]        
Commissions 2,590   8,739  
Investment banking 10,038   38,497  
Principal transactions 48   433  
Interest and dividends 185   420  
Service fees 635   1,822  
Other income 40   351  
Total revenues 15,180 19,454 55,614 49,330
Ladenburg | Advisory fees | Operating Segments        
Disaggregation of Revenue [Line Items]        
Advisory fees 1,644   5,352  
Insurance Brokerage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Commissions 32,464   99,877  
Investment banking 0   0  
Principal transactions 0   0  
Interest and dividends 0   0  
Service fees 0   0  
Other income 496   2,068  
Total revenues 32,960 $ 16,358 101,945 $ 40,998
Insurance Brokerage | Advisory fees | Operating Segments        
Disaggregation of Revenue [Line Items]        
Advisory fees $ 0   $ 0