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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Income, Nonoperating |  |  |  |  |  |  |  |  | $ 2,811 | $ 5,780 | $ 2,746
Other income |  |  |  |  |  |  |  |  | 4,456 | 1,654 | 1,643
Total revenues | $ 642,111 | $ 673,962 | $ 598,806 | $ 698,495 | $ 578,989 | $ 618,683 | $ 575,219 | $ 619,280 | 2,613,375 | 2,392,171 | 2,014,246
Core Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 1,751,414 | 1,574,480 |
Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 674,009 | 646,766 |
Incentive Commissions Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 93,557 | 81,260 |
Profit-Sharing Contingent Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 70,934 | 59,166 |
Guaranteed Supplemental Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 16,194 | 23,065 |
Retail | Core Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 1,054,619 | 994,170 |
Retail | Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 275,900 | 246,135 |
Retail | Incentive Commissions Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 89,920 | 80,505 |
Retail | Profit-Sharing Contingent Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 35,785 | 34,150 |
Retail | Guaranteed Supplemental Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 15,128 | 11,056 |
National Programs | Core Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 422,916 | 338,058 |
National Programs | Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 159,337 | 151,298 |
National Programs | Incentive Commissions Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 549 | (524) |
National Programs | Profit-Sharing Contingent Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 27,278 | 17,517 |
National Programs | Guaranteed Supplemental Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | (238) | 10,566 |
Wholesale Brokerage | Core Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 273,878 | 242,380 |
Wholesale Brokerage | Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 66,051 | 56,852 |
Wholesale Brokerage | Incentive Commissions Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 3,057 | 1,252 |
Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 7,871 | 7,499 |
Wholesale Brokerage | Guaranteed Supplemental Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 1,304 | 1,443 |
Services | Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 174,012 | 193,641 |
Operating Segments | Retail |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Income, Nonoperating |  |  |  |  |  |  |  |  | 163 | 149 | 2
Other income |  |  |  |  |  |  |  |  | 1,251 | 1,096 |
Total revenues |  |  |  |  |  |  |  |  | 1,472,766 | 1,367,261 | 1,042,763
Operating Segments | National Programs |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Income, Nonoperating |  |  |  |  |  |  |  |  | 756 | 1,397 | 506
Other income |  |  |  |  |  |  |  |  | 42 | 72 |
Total revenues |  |  |  |  |  |  |  |  | 610,640 | 518,384 | 494,463
Operating Segments | Wholesale Brokerage |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Income, Nonoperating |  |  |  |  |  |  |  |  | 184 | 178 | 165
Other income |  |  |  |  |  |  |  |  | 452 | 483 |
Total revenues |  |  |  |  |  |  |  |  | 352,797 | 310,087 | 287,014
Operating Segments | Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Income, Nonoperating |  |  |  |  |  |  |  |  | 0 | 139 | 205
Other income |  |  |  |  |  |  |  |  |  | 1 |
Total revenues |  |  |  |  |  |  |  |  | 174,012 | 193,781 | $ 189,246
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Income, Nonoperating |  |  |  |  |  |  |  |  | 1,708 | 3,917 |
Other income |  |  |  |  |  |  |  |  | 2,711 | 2 |
Total revenues |  |  |  |  |  |  |  |  | 3,160 | 2,658 |
Corporate, Non-Segment | Core Commission Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | 1 | (128) |
Corporate, Non-Segment | Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | (1,291) | (1,160) |
Corporate, Non-Segment | Incentive Commissions Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions, Other |  |  |  |  |  |  |  |  | $ 31 | $ 27 |

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