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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | $ 1,099 | $ 2,811 | $ 5,780
Other income, net | 2,777 | 4,456 | 1,654
Total revenues | 3,051,398 | 2,613,375 | 2,392,171
Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 2,010,012 | 1,751,414 |
Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 833,030 | 674,009 |
Incentive Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 103,249 | 93,557 |
Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 82,226 | 70,934 |
Guaranteed Supplemental Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 19,005 | 16,194 |
Operating Segments | Retail |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 278 | 163 | 149
Other income, net | 993 | 1,251 |
Total revenues | 1,767,938 | 1,472,766 | 1,367,261
Operating Segments | Retail | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 1,198,129 | 1,054,619 |
Operating Segments | Retail | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 414,937 | 275,900 |
Operating Segments | Retail | Incentive Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 98,254 | 89,920 |
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 38,895 | 35,785 |
Operating Segments | Retail | Guaranteed Supplemental Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 16,452 | 15,128 |
Operating Segments | National Programs |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 550 | 756 | 1,397
Other income, net | 192 | 42 |
Total revenues | 701,850 | 610,640 | 518,384
Operating Segments | National Programs | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 488,787 | 422,916 |
Operating Segments | National Programs | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 173,790 | 159,337 |
Operating Segments | National Programs | Incentive Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 1,653 | 549 |
Operating Segments | National Programs | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 35,259 | 27,278 |
Operating Segments | National Programs | Guaranteed Supplemental Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 1,619 | (238) |
Operating Segments | Wholesale Brokerage |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 155 | 184 | 178
Other income, net | 627 | 452 |
Total revenues | 403,417 | 352,797 | 310,087
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 323,054 | 273,878 |
Operating Segments | Wholesale Brokerage | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 67,233 | 66,051 |
Operating Segments | Wholesale Brokerage | Incentive Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 3,342 | 3,057 |
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 8,072 | 7,871 |
Operating Segments | Wholesale Brokerage | Guaranteed Supplemental Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 934 | 1,304 |
Operating Segments | Services |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 3 | 0 | 139
Other income, net | 0 | 0 |
Total revenues | 178,860 | 174,012 | $ 193,781
Operating Segments | Services | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 |
Operating Segments | Services | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 178,857 | 174,012 |
Operating Segments | Services | Incentive Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 |
Operating Segments | Services | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 |
Operating Segments | Services | Guaranteed Supplemental Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 |
Corporate, Non-Segment |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 113 | 1,708 |
Other income, net | 965 | 2,711 |
Total revenues | (667) | 3,160 |
Corporate, Non-Segment | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 42 | 1 |
Corporate, Non-Segment | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | (1,787) | (1,291) |
Corporate, Non-Segment | Incentive Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other |  | 31 |
Corporate, Non-Segment | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 |
Corporate, Non-Segment | Guaranteed Supplemental Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | $ 0 | $ 0 |

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