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Equity - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
Equity - Narrative (Details) $ in Millions	Jan. 16, 2024 USD ($)	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($)	May 31, 2025 USD ($)	Dec. 31, 2024 shares
Class of Stock [Line Items]
Preferred stock, issued (in shares)		0		0			0
Share repurchase program, authorized (in shares) \| $						$ 50.0
Capital Unit Class C and D
Class of Stock [Line Items]
Aggregate redemption price \| $	$ 2.6
Smith Douglas Holdings LLC
Class of Stock [Line Items]
Percentage of economic interest		17.50%		17.50%
Percentage of non-controlling interest		82.50%		82.50%			82.70%
Tax distributions \| $		$ 9.5	$ 11.8	$ 23.3	$ 26.3
Class A Common Stock
Class of Stock [Line Items]
Stock exchange ratio				1
Common stock, outstanding (in shares)		9,015,173		9,015,173			8,846,154
Class A Common Stock \| Smith Douglas Holdings LLC
Class of Stock [Line Items]
Common stock, outstanding (in shares)		9,015,173		9,015,173
Class B Common Stock
Class of Stock [Line Items]
Stock exchange ratio				1
Common stock, outstanding (in shares)		42,435,897		42,435,897			42,435,897
Class B Common Stock \| Smith Douglas Holdings LLC
Class of Stock [Line Items]
Common stock, outstanding (in shares)		42,435,897		42,435,897