v3.26.1
Earnings Per Share - Schedule of Computation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Numerator—basic:    
Net income $ 17,394 $ (19,139)
Less: Net income attributable to noncontrolling interests 1,300 $ 2,074
Net income attributable to Legence—basic $ 16,094  
Denominator—basic:    
Weighted-average Class A Common Stock outstanding—basic (in shares) 67,151  
Net income per share—basic (in usd per share) $ 0.24  
Numerator—diluted:    
Net income attributable to Legence—basic $ 16,094  
Effect of RSUs and stock options (10)  
Effect of assumed exchange of LGN B Units (2,137)  
Effect of assumed exchange of LGN B Units prior to exercise of underwriters' overallotment option (3)  
Net income attributable to Legence—diluted $ 13,944  
Denominator—diluted:    
Weighted-average Class A Common Stock outstanding—basic (in shares) 67,151  
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements 519  
Weighted-average effect of dilutive securities (in shares) 40,700  
Effect of assumed exchange of LGN B Units prior to exercise of underwriters' overallotment option (in shares) 61  
Weighted-average Class A Common Stock outstanding—diluted (in shares) 108,431  
Earnings per share—diluted (in usd per share) $ 0.13