Income taxes and tax receivable agreement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2026	Dec. 31, 2025
Income Taxes and Tax Receivable Agreement [Abstract]
Provision for income taxes	$ 100	$ 744	$ 353	$ 1,601
Amortization term of income tax benefits (in years)			15 years
Tax receivable agreement liability	9,382		$ 9,382			$ 9,857
Tax receivable agreement payments			475	0
Smith Douglas Holdings LLC
Income Taxes and Tax Receivable Agreement [Abstract]
Valuation allowance on deferred tax assets	12,300		12,300
Tax receivable agreement liability	9,400		9,400
Tax receivable agreement payments	$ 0	$ 0	$ 500	$ 0
IPO | Smith Douglas Holdings LLC | Non- Controlling Interests
Income Taxes and Tax Receivable Agreement [Abstract]
Percentage of projected tax benefits			85.00%
Forecast
Income Taxes and Tax Receivable Agreement [Abstract]
Income tax expense attributable to non controlling interest					5.40%