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Segment Reporting - Summarized Financial Information by Operating Group (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Revenues [Abstract] |  |  |
Commissions and fees | $ 1,493,680 | $ 1,377,116 | $ 1,211,828
Investment income | 11,204 | 11,921 | 6,727
Total revenues | 1,504,884 | 1,389,037 | 1,218,555
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 777,531 | 762,219 | 699,936
Outside commissions | 279,711 | 269,829 | 211,418
Selling expense | 54,534 | 50,132 | 45,681
Operating expense | 183,223 | 138,937 | 140,394
Administrative expense | 258,009 | 250,598 | 221,786
All other expenses, net(2) | 6,030 | (41,597) | 63,359
Total expense | 1,559,038 | 1,430,118 | 1,382,574
Net income (loss) | (54,154) | (41,081) | (164,019)
Other Segment Disclosures [Abstract] |  |  |
Change in fair value of contingent consideration | 5,594 | (4,949) | 61,083
Depreciation and amortization expense | 127,830 | 108,924 | 98,402
Interest expense (income), net | 121,428 | 123,644 | 119,465
Loss (gain) on divestitures | (290) | (38,953) | 0
Loss on extinguishment and modification of debt | 6,226 | 15,113 | 0
Capital expenditures | 39,527 | 41,049 | 21,376
Total assets | 3,862,220 | 3,534,731 |
Commission revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 1,186,469 | 1,129,903 | 967,552
Profit-sharing revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 94,090 | 95,532 | 93,437
Consulting and service fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 95,373 | 78,168 | 74,637
Policy fee and installment fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 78,642 | 60,719 | 65,386
Assumed premium earned |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 22,571 | 0 | 0
Other income |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 16,535 | 12,794 | 10,816
Inside advisor commissions |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 207,707 | 198,873 | 186,742
Fixed compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 335,601 | 303,048 | 294,428
Benefits and other |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 158,099 | 147,122 | 136,011
Share-based compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 71,113 | 65,503 | 56,221
Severance |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 6,790 | 5,756 | 18,514
Colleague earnout incentives |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | (1,779) | 41,917 | 8,020
Insurance Advisory Solutions |  |  |
Revenues [Abstract] |  |  |
Investment income | 4,350 | 5,779 | 3,732
Total revenues | 727,324 | 711,936 | 646,075
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 510,028 | 523,370 | 439,716
Outside commissions | 11,431 | 11,009 | 7,480
Selling expense | 24,119 | 23,098 | 19,750
Operating expense | 61,101 | 54,714 | 60,011
Administrative expense | 58,800 | 63,016 | 56,962
All other expenses, net(2) | 3,905 | (15,403) | 38,520
Total expense | 669,384 | 659,804 | 622,439
Net income (loss) | 57,940 | 52,132 | 23,636
Other Segment Disclosures [Abstract] |  |  |
Change in fair value of contingent consideration | 5,544 | (10,458) | 38,306
Depreciation and amortization expense | 57,957 | 61,707 | 55,339
Interest expense (income), net | (1) | (4) | (157)
Loss (gain) on divestitures | (1,901) | (3,843) |
Loss on extinguishment and modification of debt | 0 | 0 |
Capital expenditures | 7,140 | 6,110 | 1,330
Total assets | 2,293,873 | 2,329,152 |
Insurance Advisory Solutions | Commission revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 572,256 | 569,434 | 512,211
Insurance Advisory Solutions | Profit-sharing revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 52,969 | 60,935 | 56,549
Insurance Advisory Solutions | Consulting and service fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 89,334 | 71,852 | 68,481
Insurance Advisory Solutions | Policy fee and installment fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 | 0 | 0
Insurance Advisory Solutions | Assumed premium earned |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 |  |
Insurance Advisory Solutions | Other income |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 8,415 | 3,936 | 5,102
Insurance Advisory Solutions | Inside advisor commissions |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 175,335 | 167,695 | 153,212
Insurance Advisory Solutions | Fixed compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 220,444 | 206,029 | 191,929
Insurance Advisory Solutions | Benefits and other |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 88,144 | 82,925 | 79,500
Insurance Advisory Solutions | Share-based compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 25,680 | 25,511 | 3,693
Insurance Advisory Solutions | Severance |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 2,096 | 1,895 | 3,362
Insurance Advisory Solutions | Colleague earnout incentives |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | (1,671) | 39,315 | 8,020
Insurance Advisory Solutions | Intersegment Eliminations |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | (400) |  |
Underwriting, Capacity & Technology Solutions |  |  |
Revenues [Abstract] |  |  |
Investment income | 4,862 | 4,062 | 2,040
Total revenues | 549,452 | 472,939 | 404,539
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 116,504 | 101,513 | 88,920
Outside commissions | 264,910 | 260,204 | 209,188
Selling expense | 6,382 | 4,414 | 3,954
Operating expense | 68,503 | 36,602 | 37,441
Administrative expense | 22,730 | 15,681 | 17,124
All other expenses, net(2) | (1,740) | (28,888) | 20,131
Total expense | 477,289 | 389,526 | 376,758
Net income (loss) | 72,163 | 83,413 | 27,781
Other Segment Disclosures [Abstract] |  |  |
Change in fair value of contingent consideration | (1,405) | 5,085 | 20,930
Depreciation and amortization expense | 21,770 | 15,518 | 16,584
Interest expense (income), net | 393 | (26) | 0
Loss (gain) on divestitures | 0 | (35,110) |
Loss on extinguishment and modification of debt | 0 | 0 |
Capital expenditures | 13,566 | 17,626 | 7,571
Total assets | 758,085 | 621,407 |
Underwriting, Capacity & Technology Solutions | Commission revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 420,093 | 388,810 | 305,752
Underwriting, Capacity & Technology Solutions | Profit-sharing revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 16,051 | 12,464 | 21,174
Underwriting, Capacity & Technology Solutions | Consulting and service fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 5,939 | 6,316 | 6,156
Underwriting, Capacity & Technology Solutions | Policy fee and installment fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 78,642 | 60,719 | 65,386
Underwriting, Capacity & Technology Solutions | Assumed premium earned |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 22,571 |  |
Underwriting, Capacity & Technology Solutions | Other income |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 1,294 | 568 | 4,031
Underwriting, Capacity & Technology Solutions | Inside advisor commissions |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 683 | 1,618 | 4,530
Underwriting, Capacity & Technology Solutions | Fixed compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 63,350 | 53,453 | 53,220
Underwriting, Capacity & Technology Solutions | Benefits and other |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 33,989 | 32,757 | 26,974
Underwriting, Capacity & Technology Solutions | Share-based compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 16,344 | 9,326 | 3,727
Underwriting, Capacity & Technology Solutions | Severance |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 2,246 | 1,757 | 469
Underwriting, Capacity & Technology Solutions | Colleague earnout incentives |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | (108) | 2,602 | 0
Underwriting, Capacity & Technology Solutions | Intersegment Eliminations |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | (71,100) | (77,600) | (65,900)
Mainstreet Insurance Solutions |  |  |
Revenues [Abstract] |  |  |
Investment income | 199 | 35 | 0
Total revenues | 297,747 | 281,283 | 234,697
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 104,707 | 98,374 | 85,779
Outside commissions | 74,802 | 77,782 | 62,461
Selling expense | 15,094 | 15,754 | 14,680
Operating expense | 23,859 | 19,449 | 16,523
Administrative expense | 42,085 | 27,511 | 23,821
All other expenses, net(2) | 1,988 | 495 | 2,011
Total expense | 262,535 | 239,365 | 205,275
Net income (loss) | 35,212 | 41,918 | 29,422
Other Segment Disclosures [Abstract] |  |  |
Change in fair value of contingent consideration | 1,455 | 424 | 1,847
Depreciation and amortization expense | 41,810 | 27,167 | 23,418
Interest expense (income), net | 61 | 32 | (30)
Loss (gain) on divestitures | 0 | 0 |
Loss on extinguishment and modification of debt | 0 | 0 |
Capital expenditures | 13,703 | 8,897 | 3,482
Total assets | 712,639 | 524,576 |
Mainstreet Insurance Solutions | Commission revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 265,183 | 250,825 | 217,300
Mainstreet Insurance Solutions | Profit-sharing revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 25,070 | 22,133 | 15,714
Mainstreet Insurance Solutions | Consulting and service fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 100 | 0 | 0
Mainstreet Insurance Solutions | Policy fee and installment fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 | 0 | 0
Mainstreet Insurance Solutions | Assumed premium earned |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 |  |
Mainstreet Insurance Solutions | Other income |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 7,195 | 8,290 | 1,683
Mainstreet Insurance Solutions | Inside advisor commissions |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 31,684 | 29,560 | 26,073
Mainstreet Insurance Solutions | Fixed compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 40,784 | 38,601 | 36,359
Mainstreet Insurance Solutions | Benefits and other |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 26,406 | 22,974 | 20,808
Mainstreet Insurance Solutions | Share-based compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 5,328 | 6,719 | 1,343
Mainstreet Insurance Solutions | Severance |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 505 | 520 | 1,196
Mainstreet Insurance Solutions | Colleague earnout incentives |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 0 | 0 | 0
Mainstreet Insurance Solutions | Intersegment Eliminations |  |  |
Revenues [Abstract] |  |  |
Commissions and fees |  | (1,600) | (1,800)
Corporate Segment and Other Operating Segment |  |  |
Revenues [Abstract] |  |  |
Investment income | 1,793 | 2,045 | 955
Total revenues | (69,639) | (77,121) | (66,756)
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 46,292 | 38,962 | 85,521
Outside commissions | (71,432) | (79,166) | (67,711)
Selling expense | 8,939 | 6,866 | 7,297
Operating expense | 29,760 | 28,172 | 26,419
Administrative expense | 134,394 | 144,390 | 123,879
All other expenses, net(2) | 1,877 | 2,199 | 2,697
Total expense | 149,830 | 141,423 | 178,102
Net income (loss) | (219,469) | (218,544) | (244,858)
Other Segment Disclosures [Abstract] |  |  |
Change in fair value of contingent consideration | 0 | 0 | 0
Depreciation and amortization expense | 6,293 | 4,532 | 3,061
Interest expense (income), net | 120,975 | 123,642 | 119,652
Loss (gain) on divestitures | 1,611 | 0 |
Loss on extinguishment and modification of debt | 6,226 | 15,113 |
Capital expenditures | 5,118 | 8,416 | 8,993
Total assets | 97,623 | 59,596 |
Corporate Segment and Other Operating Segment | Commission revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | (71,063) | (79,166) | (67,711)
Corporate Segment and Other Operating Segment | Profit-sharing revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 | 0 | 0
Corporate Segment and Other Operating Segment | Consulting and service fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 | 0 | 0
Corporate Segment and Other Operating Segment | Policy fee and installment fee revenue |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 | 0 | 0
Corporate Segment and Other Operating Segment | Assumed premium earned |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | 0 |  |
Corporate Segment and Other Operating Segment | Other income |  |  |
Revenues [Abstract] |  |  |
Commissions and fees | (369) | 0 | 0
Corporate Segment and Other Operating Segment | Inside advisor commissions |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 5 | 0 | 2,927
Corporate Segment and Other Operating Segment | Fixed compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 11,023 | 4,965 | 12,920
Corporate Segment and Other Operating Segment | Benefits and other |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 9,560 | 8,466 | 8,729
Corporate Segment and Other Operating Segment | Share-based compensation |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 23,761 | 23,947 | 47,458
Corporate Segment and Other Operating Segment | Severance |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | 1,943 | 1,584 | 13,487
Corporate Segment and Other Operating Segment | Colleague earnout incentives |  |  |
Operating Expenses [Abstract] |  |  |
Colleague compensation and benefits | $ 0 | $ 0 | $ 0

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