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Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Feb. 20, 2015
Jun. 30, 2014
Dec. 31, 2013
Document and Entity Information        
Entity Registrant Name COMFORT SYSTEMS USA INC      
Entity Central Index Key 0001035983      
Document Type 10-K      
Document Period End Date Dec. 31, 2014      
Amendment Flag false      
Current Fiscal Year End Date --12-31      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Filer Category Accelerated Filer      
Entity Public Float     $ 596.4dei_EntityPublicFloat  
Entity Common Stock, Shares Outstanding   37,269,779dei_EntityCommonStockSharesOutstanding    
Treasury Stock, Shares 3,853,586us-gaap_TreasuryStockShares 3,853,586us-gaap_TreasuryStockShares   3,488,438us-gaap_TreasuryStockShares
Document Fiscal Year Focus 2014      
Document Fiscal Period Focus FY