Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Dec. 31, 2018 |
|
| Segment Reporting Information [Line Items] | |||||
| Revenues | $ 374,532 | $ 348,875 | $ 1,073,567 | $ 1,036,015 | |
| Income (loss) before income taxes | 15,297 | 12,657 | 29,638 | 34,177 | |
| EBITDA, as adjusted | 31,086 | 25,309 | 78,171 | 71,312 | |
| Identifiable assets | 818,124 | 800,591 | 818,124 | 800,591 | $ 740,904 |
| Depreciation and amortization | 5,246 | 5,845 | 17,057 | 17,416 | |
| Interest | 6,218 | 3,206 | 16,840 | 7,226 | |
| Capital expenditures | 2,891 | 3,898 | 9,044 | 10,503 | |
| Non-cash compensation | 1,536 | 1,380 | 4,474 | 4,442 | |
| Corporate | |||||
| Segment Reporting Information [Line Items] | |||||
| Revenues | 895 | 720 | 2,091 | 3,441 | |
| Income (loss) before income taxes | (11,851) | (6,557) | (33,474) | (19,418) | |
| EBITDA, as adjusted | (4,933) | (3,264) | (13,246) | (11,266) | |
| Identifiable assets | 117,674 | 150,560 | 117,674 | 150,560 | |
| Depreciation and amortization | 5 | 5 | 16 | 13 | |
| Interest | 6,026 | 2,817 | 16,308 | 5,900 | |
| Capital expenditures | (3) | (8) | (91) | 16 | |
| Non-cash compensation | 1,107 | 887 | 3,173 | 2,864 | |
| Independent Advisory and Brokerage Services | Operating Segments | |||||
| Segment Reporting Information [Line Items] | |||||
| Revenues | 305,204 | 300,015 | 890,024 | 875,015 | |
| Income (loss) before income taxes | 20,238 | 18,538 | 52,334 | 45,926 | |
| EBITDA, as adjusted | 28,466 | 27,224 | 78,040 | 72,456 | |
| Identifiable assets | 539,991 | 509,270 | 539,991 | 509,270 | |
| Depreciation and amortization | 4,653 | 5,457 | 15,270 | 16,332 | |
| Interest | 133 | 311 | 365 | 861 | |
| Capital expenditures | 2,892 | 3,780 | 9,100 | 10,035 | |
| Non-cash compensation | 251 | 317 | 765 | 936 | |
| Ladenburg | Operating Segments | |||||
| Segment Reporting Information [Line Items] | |||||
| Revenues | 23,519 | 15,180 | 56,763 | 55,614 | |
| Income (loss) before income taxes | 5,191 | 821 | 8,524 | 7,113 | |
| EBITDA, as adjusted | 5,210 | 1,110 | 9,217 | 8,029 | |
| Identifiable assets | 58,679 | 49,841 | 58,679 | 49,841 | |
| Depreciation and amortization | 120 | 122 | 359 | 345 | |
| Interest | 1 | 2 | (10) | 50 | |
| Capital expenditures | 0 | 95 | 0 | 351 | |
| Non-cash compensation | 178 | 176 | 536 | 529 | |
| Insurance Brokerage | Operating Segments | |||||
| Segment Reporting Information [Line Items] | |||||
| Revenues | 44,914 | 32,960 | 124,689 | 101,945 | |
| Income (loss) before income taxes | 1,719 | (145) | 2,254 | 556 | |
| EBITDA, as adjusted | 2,343 | 239 | 4,160 | 2,093 | |
| Identifiable assets | 101,780 | 90,920 | 101,780 | 90,920 | |
| Depreciation and amortization | 468 | 261 | 1,412 | 726 | |
| Interest | 58 | 76 | 177 | 415 | |
| Capital expenditures | 2 | 31 | 35 | 101 | |
| Non-cash compensation | $ 0 | $ 0 | $ 0 | $ 113 | |