Income taxes and tax receivable agreement (Details) $ in Thousands			3 Months Ended		6 Months Ended			12 Months Ended
	Jan. 16, 2024	Jan. 10, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($) LLCUnit Transactions	Jun. 30, 2023 USD ($)	Dec. 31, 2024	Dec. 31, 2023 USD ($)
Income Taxes and Tax Receivable Agreement [Abstract]
Estimated annual effective tax rate			20.80%		20.80%
Income tax provision			$ 1,132	$ 0	$ 2,000	$ 2,053	$ 0
Deferred tax asset			10,934		10,934	10,934			$ 0
Deferred tax asset for investment			15,100		15,100	15,100
Valuation allowance on deferred tax assets			14,300		14,300	$ 14,300
Amortization term of income tax benefits						15 years
Tax receivable agreement liability			10,400		10,400	$ 10,400
Deferred tax asset and TRA liability recorded against additional paid-in capital			100		100	100
Smith Douglas Holdings LLC [Member]
Income Taxes and Tax Receivable Agreement [Abstract]
Deferred tax asset			$ 10,500		$ 10,500	$ 10,500
Smith Douglas Holdings LLC [Member] | Continuing Equity Owners [Member]
Income Taxes and Tax Receivable Agreement [Abstract]
LLC Interests Purchased | LLCUnit						2,435,897
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								20.80%