v3.25.2
Description of business and summary of significant accounting policies - Initial Public Offering and Reorganization Transactions (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jan. 16, 2024
USD ($)
Vote
shares
LLCUnit
$ / shares
Jun. 30, 2025
USD ($)
Vote
LLCUnit
Jun. 30, 2024
USD ($)
Initial Public Offering [Abstract]      
Issuance of Class A common stock in IPO, net of underwriting discount | $ $ 172,800 $ 0 $ 172,765
Ownership interests recapitalized into LLC interests | LLCUnit 44,871,794    
Smith Douglas Holdings LLC | Non- Controlling Interests      
Initial Public Offering [Abstract]      
LLC interests purchased (in shares) | LLCUnit   2,435,897  
Class A Common Stock      
Initial Public Offering [Abstract]      
Number of votes per share | Vote   1  
Purchase Of Interest In Entity, Shares Acquired 6,410,257    
Acquired interest in entity, value of interest acquired | $ $ 125,200    
Class A Common Stock | Smith Douglas Holdings LLC | Non- Controlling Interests      
Initial Public Offering [Abstract]      
LLC interests purchased (in shares) 2,435,897    
Value of LLC interests purchased | $ $ 47,600    
Class B Common Stock      
Initial Public Offering [Abstract]      
Number of votes per share | Vote   10  
Maximum number of Class B common stock outstanding compared to total of Class A and Class B common stock outstanding for occurrence of sunset 10.00%    
Shares issued (in shares) 42,435,897    
IPO | Class A Common Stock      
Initial Public Offering [Abstract]      
Number of shares issued (in shares) 8,846,154    
Offering price per share (in dollars per share) | $ / shares $ 21.00    
Number of votes per share | Vote 1    
IPO | Class B Common Stock      
Initial Public Offering [Abstract]      
Number of votes per share | Vote 10    
Underwriters' Option | Class A Common Stock      
Initial Public Offering [Abstract]      
Number of shares issued (in shares) 1,153,846