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Stockholders' Equity / Member's Equity (Details)
$ / shares in Units, $ in Thousands
 4 Months Ended 12 Months Ended
Feb. 25, 2026
USD ($)
shares
Jan. 08, 2026
shares
Dec. 16, 2025
$ / shares
shares
Dec. 31, 2025
vote
$ / shares
shares
Dec. 31, 2025
vote
$ / shares
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 12, 2025
shares
Schedule of Equity Method Investments [Line Items]                
Conversion ratio         1      
Preferred stock, shares authorized (in shares)     50,000,000 50,000,000 50,000,000      
Preferred stock, par value (in usd per share) | $ / shares     $ 0.01 $ 0.01 $ 0.01      
Preferred stock, shares issued (in shares)       0 0      
Preferred stock, shares outstanding (in shares)       0 0      
Tax distributions | $           $ 1,400 $ 0  
Capital distributions | $           300,200 $ 1,500  
Capital distribution, return to holders | $           $ 400    
Subsequent Event | Employee Stock                
Schedule of Equity Method Investments [Line Items]                
Common stock reservation of shares (in shares) 1,580,053              
Eligible employees contribution percentage 15.00%              
Maximum annual cash payments | $ $ 25              
Purchase price of common stock, percent 90.00%              
LGN A Units                
Schedule of Equity Method Investments [Line Items]                
Conversion ratio         1      
Common stock, shares outstanding (in shares)       63,856,975 63,856,975      
LGN B Units                
Schedule of Equity Method Investments [Line Items]                
Conversion ratio         1      
LGN B Units | Legence Parent                
Schedule of Equity Method Investments [Line Items]                
Common stock, shares outstanding (in shares)       41,479,954 41,479,954      
Common Class A                
Schedule of Equity Method Investments [Line Items]                
Conversion ratio         1      
Common stock, shares outstanding (in shares)       63,856,975 63,856,975      
Common stock, shares authorized (in shares)     1,000,000,000 1,000,000,000 1,000,000,000      
Common stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01 $ 0.01      
Number of votes | vote       1 1      
Common Class A | Common Stock                
Schedule of Equity Method Investments [Line Items]                
Exchange of Class B Common Stock to Class A Common Stock (in shares)     5,200,808   5,200,808      
Common stock, shares outstanding (in shares)       63,856,975 63,856,975      
Common Class A | Subsequent Event                
Schedule of Equity Method Investments [Line Items]                
Exchanged shares (in shares)   780,121            
Common Class A | Secondary Offering                
Schedule of Equity Method Investments [Line Items]                
Number of shares issued (in shares)     8,402,178          
Sale of stock, price (in usd per share) | $ / shares     $ 45.00          
Common Class A | Over-Allotment Option                
Schedule of Equity Method Investments [Line Items]                
Number of shares issued (in shares)     1,260,326          
Sale of stock option period     30 days          
Common Class A | Over-Allotment Option | Subsequent Event                
Schedule of Equity Method Investments [Line Items]                
Number of shares issued (in shares)   1,260,326            
Common Class B                
Schedule of Equity Method Investments [Line Items]                
Common stock, shares outstanding (in shares)       41,479,954 41,479,954      
Common stock, shares authorized (in shares)     200,000,000 200,000,000 200,000,000      
Common stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01 $ 0.01      
Number of votes | vote       1 1      
Common Class B | Common Stock                
Schedule of Equity Method Investments [Line Items]                
Exchange of Class B Common Stock to Class A Common Stock (in shares)         (5,200,808)      
Common stock, shares outstanding (in shares)       41,479,954 41,479,954      
Legence Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Ownership (as percent)       100.00% 100.00%     100.00%
Common stock, shares outstanding (in shares)       105,336,929 105,336,929     105,191,329
Exchange of Class B Common Stock to Class A Common Stock (in shares)       0        
Legence Holdings LLC | LGN A Units                
Schedule of Equity Method Investments [Line Items]                
Ownership (as percent)       60.60% 60.60%     55.60%
Common stock, shares outstanding (in shares)       63,856,975 63,856,975     58,510,567
Exchange of Class B Common Stock to Class A Common Stock (in shares)       5,200,808        
Legence Holdings LLC | LGN B Units                
Schedule of Equity Method Investments [Line Items]                
Common stock, shares outstanding (in shares)       41,479,954 41,479,954     46,680,762
Exchange of Class B Common Stock to Class A Common Stock (in shares)       (5,200,808)        
Legence Holdings LLC | LGN B Units | Legence Parent                
Schedule of Equity Method Investments [Line Items]                
Common stock, shares outstanding (in shares)       41,479,954 41,479,954