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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | $ 430 | $ 349 | $ 909 | $ 1,844
Other income, net | 221 | 2,217 | 2,414 | 3,364
Total revenues | 770,305 | 673,962 | 2,312,933 | 1,971,264
Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 509,072 |  | 1,521,438 |
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 220,936 |  | 618,455 |
Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 16,624 |  | 91,983 |
Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 17,618 |  | 63,163 |
Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 5,404 |  | 14,571 |
Retail | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 284,536 |  | 905,470 |
Retail | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 109,915 |  | 307,314 |
Retail | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 15,460 |  | 88,219 |
Retail | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 8,705 |  | 32,848 |
Retail | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 4,454 |  | 12,383 |
National Programs | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 133,649 |  | 369,703 |
National Programs | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 49,779 |  | 125,329 |
National Programs | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 444 |  | 1,443 |
National Programs | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 6,499 |  | 23,833 |
National Programs | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 549 |  | 1,316 |
Wholesale Brokerage | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 90,862 |  | 246,233 |
Wholesale Brokerage | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 17,938 |  | 51,574 |
Wholesale Brokerage | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 720 |  | 2,321 |
Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 2,414 |  | 6,482 |
Wholesale Brokerage | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 401 |  | 872 |
Services | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other |  |  |  |
Services | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 43,732 |  | 135,590 |
Services | Incentive Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 |  |  |
Services | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 |  |  |
Services | Guaranteed Supplemental Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 |  |  |
Operating Segments | Retail |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 236 | 19 | 271 | 143
Other income, net | 115 |  | 930 |
Total revenues | 423,421 | 359,473 | 1,347,435 | 1,119,524
Operating Segments | National Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 136 | 205 | 423 | 597
Other income, net | 9 |  | 185 |
Total revenues | 191,065 | 168,018 | 522,232 | 451,098
Operating Segments | Wholesale Brokerage |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 35 | 45 | 120 | 141
Other income, net | 98 |  | 332 |
Total revenues | 112,468 | 101,239 | 307,934 | 267,790
Operating Segments | Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 0 | 0 | 3 | 0
Total revenues | 43,732 | $ 43,497 | 135,593 | $ 130,879
Corporate, Non-Segment |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 23 |  | 92 |
Other income, net | (1) |  | 967 |
Total revenues | (381) |  | (261) |
Corporate, Non-Segment | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 25 |  | 32 |
Corporate, Non-Segment | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | $ (428) |  | $ (1,352) |

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