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Income taxes and tax receivable agreement (Details) LLCUnit in Thousands, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 16, 2024 | Jan. 11, 2024 USD ($) LLCUnit | Jan. 10, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) Transactions | Mar. 31, 2023 USD ($) | Dec. 31, 2024 | Dec. 31, 2023 USD ($)
Income Taxes and Tax Receivable Agreement [Abstract] |  |  |  |  |  |  |  |
Estimated annual effective tax rate |  |  |  | 25.00% |  |  |  |
Income tax provision |  |  |  | $ 900 | $ 921 | $ 0 |  |
Deferred tax asset |  | $ 17,600 |  | $ 13,054 | $ 13,054 |  |  | $ 0
Valuation allowance on deferred tax assets |  | 16,700 |  |  |  |  |  |
Amortization term of income tax benefits |  |  |  |  | 15 years |  |  |
Tax receivable agreement liability |  | 10,400 |  |  |  |  |  |
Deferred tax asset and TRA liability recorded against additional paid-in capital |  | 1,800 |  |  |  |  |  |
Smith Douglas Holdings LLC [Member] |  |  |  |  |  |  |  |
Income Taxes and Tax Receivable Agreement [Abstract] |  |  |  |  |  |  |  |
Deferred tax asset |  | $ 12,200 |  |  |  |  |  |
Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member] |  |  |  |  |  |  |  |
Income Taxes and Tax Receivable Agreement [Abstract] |  |  |  |  |  |  |  |
LLC Interests Purchased | LLCUnit |  | 2,436 |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |
Income Taxes and Tax Receivable Agreement [Abstract] |  |  |  |  |  |  |  |
Income tax provision |  |  | $ 0 |  |  |  |  |
Number of business transactions | Transactions |  |  |  |  | 0 |  |  |
IPO [Member] | Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member] |  |  |  |  |  |  |  |
Income Taxes and Tax Receivable Agreement [Abstract] |  |  |  |  |  |  |  |
Percentage of projected tax benefits | 85.00% |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |
Income Taxes and Tax Receivable Agreement [Abstract] |  |  |  |  |  |  |  |
Estimated annual effective tax rate |  |  |  |  |  |  | 25.00% |

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