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Earnings Per Share - Schedule of Computation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 4 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Numerator:        
Net loss   $ (77,303) $ (27,643) $ (46,026)
Less: Net loss attributable to noncontrolling interests   (17,523) 912 0
Net loss attributable to Legence   $ (59,780) $ (28,555) $ (46,026)
Denominator:        
Weighted-average Class A Common Stock outstanding—basic (in shares) 59,381      
Weighted average Class A Common Stock outstanding—diluted (in shares) 59,381      
Net loss per share—basic (in usd per share) $ (0.57)      
Net loss per share—diluted (in usd per share) $ (0.57)      
Common Class A        
Numerator:        
Net loss $ (55,951)      
Less: Net loss attributable to noncontrolling interests (22,155)      
Net loss attributable to Legence $ (33,796)      
Denominator:        
Weighted-average Class A Common Stock outstanding—basic (in shares) 59,381      
Weighted average Class A Common Stock outstanding—diluted (in shares) 59,381      
Net loss per share—basic (in usd per share) $ (0.57)      
Net loss per share—diluted (in usd per share) $ (0.57)