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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | $ 229 | $ 333 | $ 479 | $ 1,495
Other income, net | 1,204 | 316 | 2,193 | 1,147
Total revenues | 727,352 | 598,806 | 1,542,628 | 1,297,302
Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 472,812 |  | 1,012,367 |
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 213,530 |  | 397,518 |
Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 16,073 |  | 75,359 |
Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 19,594 |  | 45,544 |
Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 3,910 |  | 9,168 |
Retail | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 263,474 |  | 620,932 |
Retail | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 110,348 |  | 197,399 |
Retail | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 15,412 |  | 72,760 |
Retail | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 8,408 |  | 24,143 |
Retail | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 3,315 |  | 7,930 |
National Programs | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 125,310 |  | 236,055 |
National Programs | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 41,221 |  | 75,550 |
National Programs | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 210 |  | 998 |
National Programs | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 9,017 |  | 17,333 |
National Programs | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 373 |  | 767 |
Wholesale Brokerage | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 84,027 |  | 155,371 |
Wholesale Brokerage | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 17,574 |  | 33,636 |
Wholesale Brokerage | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 451 |  | 1,601 |
Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 2,169 |  | 4,068 |
Wholesale Brokerage | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 222 |  | 471 |
Services | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other |  |  | 0 |
Services | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 44,887 |  | 91,858 |
Services | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |
Services | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |
Services | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 |  | 0 |
Operating Segments | Retail |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 17 | 41 | 35 | 124
Other income, net | 125 |  | 815 |
Total revenues | 401,099 | 312,562 | 924,014 | 760,051
Operating Segments | National Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 134 | 129 | 286 | 392
Other income, net | 9 |  | 178 |
Total revenues | 176,274 | 154,667 | 331,167 | 283,080
Operating Segments | Wholesale Brokerage |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 44 | 46 | 85 | 97
Other income, net | 104 |  | 234 |
Total revenues | 104,591 | 88,853 | 195,466 | 166,551
Operating Segments | Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 0 | 0 | 3 | 0
Total revenues | 44,887 | $ 42,930 | 91,861 | $ 87,382
Corporate, Non-Segment |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 34 |  | 70 |
Other income, net | 966 |  | 966 |
Total revenues | 501 |  | 120 |
Corporate, Non-Segment | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 1 |  | 9 |
Corporate, Non-Segment | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | $ (500) |  | $ (925) |

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