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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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LLC interests purchased.

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Percentage of payment on tax benefit.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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