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Business Combinations - Schedule of Business Acquisitions (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Business Combination, Consideration Transferred [Abstract] |  |
Cash consideration paid | $ 567,889 |
Fair value of contingent earnout consideration | 315,998 |
Fair value of equity interest | 510,561 | $ 863
Deferred payments(1) | 165,164 |
Total consideration | 1,559,612 |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |
Cash | 16,393 |
Fiduciary cash | 103,993 |
Assumed premiums, commissions and fees receivable | 45,174 |
Fiduciary receivables | 191,182 |
Prepaid expenses and other current assets | 2,355 |
Property and equipment | 8,778 |
Right-of-use assets | 27,302 |
Other assets | 5,728 |
Intangible assets | 550,983 |
Fiduciary liabilities | (295,175) |
Commissions payable | (45,340) |
Accrued expenses and other current liabilities | (21,590) |
Operating lease liabilities, less current portion | (22,858) |
Deferred tax liabilities | (142,208) |
Total identifiable net assets acquired | 424,717 |
Goodwill | 1,134,895 |
Net assets acquired less goodwill and noncontrolling interest | 1,559,612 |
Non-current portion of deferred payment obligations | 129,400 |
Total Business Combinations |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |
Maximum potential contingent earnout consideration | 544,855 |
CAC Group |  |
Business Combination, Consideration Transferred [Abstract] |  |
Cash consideration paid | 445,535 |
Fair value of contingent earnout consideration | 225,000 |
Fair value of equity interest | 494,778 |
Deferred payments(1) | 54,900 |
Total consideration | 1,220,213 |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |
Cash | 13,692 |
Fiduciary cash | 88,804 |
Assumed premiums, commissions and fees receivable | 43,869 |
Fiduciary receivables | 188,515 |
Prepaid expenses and other current assets | 2,044 |
Property and equipment | 8,778 |
Right-of-use assets | 26,494 |
Other assets | 5,728 |
Intangible assets | 410,245 |
Fiduciary liabilities | (277,319) |
Commissions payable | (45,172) |
Accrued expenses and other current liabilities | (15,507) |
Operating lease liabilities, less current portion | (22,050) |
Deferred tax liabilities | (115,997) |
Total identifiable net assets acquired | 312,124 |
Goodwill | 908,089 |
Net assets acquired less goodwill and noncontrolling interest | 1,220,213 |
Maximum potential contingent earnout consideration | 250,000 |
Obie |  |
Business Combination, Consideration Transferred [Abstract] |  |
Cash consideration paid | 86,958 |
Fair value of contingent earnout consideration | 81,755 |
Fair value of equity interest | 8,393 |
Deferred payments(1) | 110,264 |
Total consideration | 287,370 |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |
Cash | 1,962 |
Fiduciary cash | 15,189 |
Assumed premiums, commissions and fees receivable | 607 |
Fiduciary receivables | 2,667 |
Prepaid expenses and other current assets | 272 |
Property and equipment | 0 |
Right-of-use assets | 808 |
Other assets | 0 |
Intangible assets | 121,688 |
Fiduciary liabilities | (17,856) |
Commissions payable | 0 |
Accrued expenses and other current liabilities | (5,553) |
Operating lease liabilities, less current portion | (808) |
Deferred tax liabilities | (26,211) |
Total identifiable net assets acquired | 92,765 |
Goodwill | 194,605 |
Net assets acquired less goodwill and noncontrolling interest | 287,370 |
Maximum potential contingent earnout consideration | 275,000 |
Capstone |  |
Business Combination, Consideration Transferred [Abstract] |  |
Cash consideration paid | 35,396 |
Fair value of contingent earnout consideration | 9,243 |
Fair value of equity interest | 7,390 |
Deferred payments(1) | 0 |
Total consideration | 52,029 |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |
Cash | 739 |
Fiduciary cash | 0 |
Assumed premiums, commissions and fees receivable | 698 |
Fiduciary receivables | 0 |
Prepaid expenses and other current assets | 39 |
Property and equipment | 0 |
Right-of-use assets | 0 |
Other assets | 0 |
Intangible assets | 19,050 |
Fiduciary liabilities | 0 |
Commissions payable | (168) |
Accrued expenses and other current liabilities | (530) |
Operating lease liabilities, less current portion | 0 |
Deferred tax liabilities | 0 |
Total identifiable net assets acquired | 19,828 |
Goodwill | 32,201 |
Net assets acquired less goodwill and noncontrolling interest | 52,029 |
Maximum potential contingent earnout consideration | $ 19,855 |

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