v3.25.4

Mergers and Acquisitions - Additional Information (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2025 USD ($) | Jul. 01, 2025 USD ($) | May 16, 2025 USD ($) | May 01, 2025 USD ($) | Feb. 03, 2025 USD ($) | Nov. 04, 2024 USD ($) managingGeneralUnderwriter | Oct. 01, 2024 USD ($) | Sep. 13, 2024 USD ($) program | Sep. 01, 2024 USD ($) | Aug. 30, 2024 USD ($) | May 01, 2024 USD ($) | Dec. 01, 2023 USD ($) | Jul. 03, 2023 USD ($) | Jul. 01, 2023 USD ($) | Jan. 03, 2023 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Aug. 31, 2024 USD ($)
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,316 | $ 4,744 |  |
Business combination, acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300 |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,500 | 102,800 | $ 47,200 |
Estimated tax deductible goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,100 | 735,800 |  |
Change in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,122 | (22,859) | 5,421 |
Increase in financing costs and interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,600 | 99,000 |
General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,100 | $ 7,100 |
2025 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,100 |  |  |
2025 Acquisitions | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
2025 Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Velocity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 549,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 19,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |
Measurement period adjustment, other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 |  |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 |  |  |
USQ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 28,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | $ 23,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 |  |  |
360° Underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 28,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
J.M. Wilson Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | $ 67,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |
Equity consideration for acquisition |  | $ 20,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment related to commissions and fees receivable – net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800 |  |  |
Measurement period adjustments, intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |
Stewart Specialty Risk Underwriting Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 124,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stewart Specialty Risk Underwriting Ltd. | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration for acquisition | $ 8,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Castel Underwriting Agencies Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  | $ 247,600 |  |  |  |  |  |  |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,000) |  |
Contingent consideration, asset |  |  |  |  |  |  |  |  |  |  | 4,900 |  |  |  |  |  |  |  |
Measurement period adjustments, deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600 |  |
Measurement period adjustments, taxes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 |  |
Castel Underwriting Agencies Limited | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration for acquisition |  |  |  |  |  |  |  |  |  |  | $ 2,200 |  |  |  |  |  |  |  |
US Assure Insurance Services of Florida, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  | $ 1,079,800 |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 103,800
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,200 |  |
Greenhill Underwriting Insurance Services, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  | $ 11,700 |  |  |  |  |  |  |  |  |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |  |
Measurement period adjustments, intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |
Ethos Property and Casualty Managing General Underwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  | $ 44,000 |  |  |  |  |  |  |  |  |  |  |
Number of underwriting programs for insurance carriers | program |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |
EverSports & Entertainment Insurance, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 43,100 |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment related to commissions and fees receivable – net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |
Innovisk Capital Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 426,800 |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment related to commissions and fees receivable – net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,700 |  |  |
Number of managing general underwriters | managingGeneralUnderwriter |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment related to current accrued compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200 |  |  |
Measurement period adjustments, deferred tax assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200 |  |  |
Griffin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,500 |  |  |  |
ACE Benefit Partners & Point6 Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,800 |  |  |  |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |
Change in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |
Socius Insurance Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 253,500 |  |  |  |  |  |
Change in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | 5,800 |  |  |  |  |  |
Socius Insurance Services | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration for acquisition |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700 |  |  |  |  |  |
AccuRisk Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  | $ 98,300 |  |  |  |  |  |  |
Measurement period adjustments, deferred tax assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |
Change in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (300) |  |
Business Combinations, Aggregate Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum contingent consideration obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 597,400 |  |  |
Maximum returnable consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,500 |  |  |

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