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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Contingency [Line Items]      
Loss before income tax $ 55,142 $ 23,122 $ 53,944
Valuation allowance 181,533 129 0
Decreases based on tax positions related to prior periods 2,453 0 $ 0
Decrease in unrecognized tax benefits 2,200    
Income tax penalties and interest accrued 3,100 4,300  
Variable Interest Entity, Primary Beneficiary      
Income Tax Contingency [Line Items]      
Increase in unrecognized tax benefits   (7,700)  
Income tax penalties and interest accrued 2,700 $ 4,100  
Investment In Legence Holdings      
Income Tax Contingency [Line Items]      
Valuation allowance 169,200    
Domestic Tax Jurisdiction      
Income Tax Contingency [Line Items]      
Interest carryforward 23,300    
Operating loss carryforwards 34,200    
State and Local Jurisdiction      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 62,000    
Net operating losses $ 2,400