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
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Commissions $ 166,929 $ 163,286
Advisory fees 113,908 114,383
Investment banking 9,829 16,490
Principal transactions 928 167
Interest and dividends 1,216 787
Service fees 32,203 24,902
Other income 10,442 9,369
Total revenues 335,455 329,384
Corporate    
Disaggregation of Revenue [Line Items]    
Commissions 0 0
Advisory fees 0 54
Investment banking 0 0
Principal transactions (93) 0
Interest and dividends 272 178
Service fees 253 194
Other income 55 55
Total revenues 487 481
Independent Advisory and Brokerage Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Commissions 128,871 129,745
Advisory fees 112,348 112,513
Investment banking 197 116
Principal transactions (7) 11
Interest and dividends 669 534
Service fees 31,361 24,140
Other income 9,549 8,470
Total revenues 282,988 275,529
Ladenburg | Operating Segments    
Disaggregation of Revenue [Line Items]    
Commissions 2,490 3,213
Advisory fees 1,560 1,816
Investment banking 9,632 16,374
Principal transactions 1,028 156
Interest and dividends 275 75
Service fees 589 568
Other income 237 112
Total revenues 15,811 22,314
Insurance Brokerage | Operating Segments    
Disaggregation of Revenue [Line Items]    
Commissions 35,568 30,328
Advisory fees 0 0
Investment banking 0 0
Principal transactions 0 0
Interest and dividends 0 0
Service fees 0 0
Other income 601 732
Total revenues $ 36,169 $ 31,060