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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Commissions $ 180,381 $ 132,975 $ 343,667 $ 263,025
Investment banking 11,729 12,887 28,219 19,376
Principal transactions 233 258 400 578
Interest and dividends 1,080 657 1,867 1,292
Service fees 27,585 20,336 52,487 38,892
Other income 14,110 9,781 23,479 17,019
Total revenues 357,756 311,536 687,140 601,827
Corporate        
Disaggregation of Revenue [Line Items]        
Commissions 0   0  
Investment banking (669)   (669)  
Principal transactions 8   8  
Interest and dividends 300   478  
Service fees 194   388  
Other income 2,351   2,406  
Total revenues 2,240 331 2,721 615
Advisory fees        
Disaggregation of Revenue [Line Items]        
Advisory fees 122,638 134,642 237,021 261,645
Advisory fees | Corporate        
Disaggregation of Revenue [Line Items]        
Advisory fees 56   110  
Independent Advisory and Brokerage Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Commissions 140,360   270,105  
Investment banking 313   429  
Principal transactions (4)   7  
Interest and dividends 620   1,154  
Service fees 26,772   50,912  
Other income 10,720   19,190  
Total revenues 299,471 280,855 575,000 546,696
Independent Advisory and Brokerage Services | Advisory fees | Operating Segments        
Disaggregation of Revenue [Line Items]        
Advisory fees 120,690   233,203  
Ladenburg | Operating Segments        
Disaggregation of Revenue [Line Items]        
Commissions 2,936   6,149  
Investment banking 12,085   28,459  
Principal transactions 229   385  
Interest and dividends 160   235  
Service fees 619   1,187  
Other income 199   311  
Total revenues 18,120 18,011 40,434 29,876
Ladenburg | Advisory fees | Operating Segments        
Disaggregation of Revenue [Line Items]        
Advisory fees 1,892   3,708  
Insurance Brokerage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Commissions 37,085   67,413  
Investment banking 0   0  
Principal transactions 0   0  
Interest and dividends 0   0  
Service fees 0   0  
Other income 840   1,572  
Total revenues 37,925 $ 12,339 68,985 $ 24,640
Insurance Brokerage | Advisory fees | Operating Segments        
Disaggregation of Revenue [Line Items]        
Advisory fees $ 0   $ 0