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Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Entity Information [Line Items] |  |  |
Allowance for estimated policy cancellations | $ 22,300,000 | $ 18,700,000 |
Producer commissions chargeback | 10,500,000 | 10,300,000 |
Gross Carrying Value | 1,445,384,000 | 1,302,369,000 |
Capitalized costs, cloud computing arrangements | 7,500,000 |  |
Debt financing costs included in other assets, gross | 9,500,000 | 9,500,000 |
Deferred financing costs included in other assets, accumulated amortization | 5,700,000 | 4,600,000 |
Deferred financing costs included in long-term debt, gross | 45,300,000 | 45,100,000 |
Deferred financing costs included in long-term debt, accumulated amortization | 20,300,000 | 15,800,000 |
Amortization of deferred financing costs | 5,690,000 | 5,841,000 | $ 5,129,000
Investments in equity securities | 5,900,000 | 6,100,000 |
IBNR Reserve | $ 3,300,000 | 3,200,000 |
Income tax benefit, percentage of benefit payable to noncontrolling owners | 85.00% |  |
Cash deposits, FDIC insured amount per account | $ 250,000 |  |
Emerald Bay |  |  |
Entity Information [Line Items] |  |  |
Interest in Baldwin Holdings held by Baldwin | 2.50% |  |
Emerald Bay | Related Party |  |  |
Entity Information [Line Items] |  |  |
Investments in Emerald Bay | $ 2,300,000 | $ 2,100,000 |
Builder Risk Management |  |  |
Entity Information [Line Items] |  |  |
Investments in Emerald Bay | $ 11,700,000 |  |
Customer One | Revenue Benchmark | Customer Concentration Risk [Member] |  |  |
Entity Information [Line Items] |  |  |
Concentration | 10.00% | 10.00% |
Minimum | Emerald Bay |  |  |
Entity Information [Line Items] |  |  |
Equity Method Investment, Ownership Percentage Influence Threshold, Less Than | 3.00% |  |
Maximum | Emerald Bay |  |  |
Entity Information [Line Items] |  |  |
Equity Method Investment, Ownership Percentage Influence Threshold, Less Than | 5.00% |  |
Capitalized software | Minimum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 2 years |  |
Capitalized software | Maximum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 5 years |  |
Acquired Relationships [Member] |  |  |
Entity Information [Line Items] |  |  |
Gross Carrying Value | $ 1,253,396,000 | $ 1,136,326,000 |
Acquired Relationships [Member] | Minimum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 10 years |  |
Acquired Relationships [Member] | Maximum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 20 years |  |
Trade Names |  |  |
Entity Information [Line Items] |  |  |
Gross Carrying Value | $ 28,474,000 | 27,924,000 |
Trade Names | Minimum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 1 year |  |
Trade Names | Maximum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 5 years |  |
Software |  |  |
Entity Information [Line Items] |  |  |
Gross Carrying Value | $ 163,514,000 | 138,119,000 |
Software | Minimum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 2 years |  |
Software | Maximum |  |  |
Entity Information [Line Items] |  |  |
Useful Life | 5 years |  |
Capitalized software |  |  |
Entity Information [Line Items] |  |  |
Gross Carrying Value | $ 92,300,000 | $ 66,900,000 |

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