v3.26.1
FAIR VALUE MEASUREMENT - Collective Trust Funds (Details) - TopBuild Corp. 401(k) Plan - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
FAIR VALUE MEASUREMENT    
Investments, at fair value $ 674,592,317 $ 589,745,437
Measured at NAV    
FAIR VALUE MEASUREMENT    
Investments, at fair value 511,371,646 448,710,242
Collective trust funds    
FAIR VALUE MEASUREMENT    
Investments, at fair value 511,371,646 448,710,242
Collective trust funds | Measured at NAV    
FAIR VALUE MEASUREMENT    
Investments, at fair value 511,371,646 448,710,242
FID FRDM Target Date Funds and Core Commingled Pool    
FAIR VALUE MEASUREMENT    
Unfunded Commitments $ 0 $ 0
Redemption Notice Period 90 days 90 days
FID FRDM Target Date Funds and Core Commingled Pool | Measured at NAV    
FAIR VALUE MEASUREMENT    
Investments, at fair value $ 505,845,702 $ 442,403,418
Managed Income Portfolio - Class 2    
FAIR VALUE MEASUREMENT    
Unfunded Commitments $ 0 $ 0
Managed Income Portfolio - Class 2 | Participants    
FAIR VALUE MEASUREMENT    
Redemption Notice Period 0 days 0 days
Managed Income Portfolio - Class 2 | Sponsor    
FAIR VALUE MEASUREMENT    
Redemption Notice Period 12 months 12 months
Managed Income Portfolio - Class 2 | Measured at NAV    
FAIR VALUE MEASUREMENT    
Investments, at fair value $ 5,525,944 $ 6,306,824