Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Commissions                 $ 696,331 $ 536,028 $ 510,023
Advisory fees                 474,423 560,930 464,136
Investment banking                 56,256 46,453 25,453
Principal transactions                 (328) 857 751
Interest and dividends                 4,971 2,550 2,879
Service fees                 119,430 85,330 71,515
Other income                 40,053 36,004 32,196
Revenues $ 355,121 $ 348,875 $ 357,756 $ 329,384 $ 344,016 $ 322,309 $ 311,536 $ 290,291 1,391,136 1,268,152 1,106,953
Corporate                      
Disaggregation of Revenue [Line Items]                      
Commissions                 0    
Advisory fees                 209    
Investment banking                 (854)    
Principal transactions                 174    
Interest and dividends                 1,566    
Service fees                 888    
Other income                 2,889    
Revenues                 4,872 3,960 3,763
Independent Advisory and Brokerage Services | Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Commissions                 540,523    
Advisory fees                 467,044    
Investment banking                 947    
Principal transactions                 22    
Interest and dividends                 2,566    
Service fees                 116,047    
Other income                 33,894    
Revenues                 1,161,043 1,140,380 1,003,282
Ladenburg | Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Commissions                 11,468    
Advisory fees                 7,170    
Investment banking                 56,163    
Principal transactions                 (524)    
Interest and dividends                 839    
Service fees                 2,495    
Other income                 483    
Revenues                 78,094 $ 66,680 $ 49,425
Insurance Brokerage | Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Commissions                 144,340    
Advisory fees                 0    
Investment banking                 0    
Principal transactions                 0    
Interest and dividends                 0    
Service fees                 0    
Other income                 2,787    
Revenues                 $ 147,127