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Quarterly Results of Operations (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Results of Operations (Unaudited)
Revenue	$ 356,468us-gaap_SalesRevenueNet	$ 370,145us-gaap_SalesRevenueNet	$ 362,801us-gaap_SalesRevenueNet	$ 321,381us-gaap_SalesRevenueNet	$ 330,340us-gaap_SalesRevenueNet	$ 349,989us-gaap_SalesRevenueNet	$ 351,053us-gaap_SalesRevenueNet	$ 325,890us-gaap_SalesRevenueNet	$ 1,410,795us-gaap_SalesRevenueNet	$ 1,357,272us-gaap_SalesRevenueNet	$ 1,331,185us-gaap_SalesRevenueNet
Gross profit	69,304us-gaap_GrossProfit	66,459us-gaap_GrossProfit	61,859us-gaap_GrossProfit	52,149us-gaap_GrossProfit	61,428us-gaap_GrossProfit	67,021us-gaap_GrossProfit	59,967us-gaap_GrossProfit	51,467us-gaap_GrossProfit	249,771us-gaap_GrossProfit	239,883us-gaap_GrossProfit	207,621us-gaap_GrossProfit
Operating income	14,892us-gaap_OperatingIncomeLoss	14,785us-gaap_OperatingIncomeLoss	10,648us-gaap_OperatingIncomeLoss	1,897us-gaap_OperatingIncomeLoss	9,059us-gaap_OperatingIncomeLoss	17,734us-gaap_OperatingIncomeLoss	14,379us-gaap_OperatingIncomeLoss	5,086us-gaap_OperatingIncomeLoss	42,222us-gaap_OperatingIncomeLoss	46,258us-gaap_OperatingIncomeLoss	22,303us-gaap_OperatingIncomeLoss
Income from continuing operations	11,821us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	9,379us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	6,336us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1,078us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	5,932us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	11,637us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	8,314us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2,749us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	28,614us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	28,632us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	11,494us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations, net of tax				(15)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	3us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(25)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax		(54)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income including noncontrolling interests	11,821us-gaap_ProfitLoss	9,379us-gaap_ProfitLoss	6,336us-gaap_ProfitLoss	1,063us-gaap_ProfitLoss	5,935us-gaap_ProfitLoss	11,612us-gaap_ProfitLoss	8,314us-gaap_ProfitLoss	2,695us-gaap_ProfitLoss	28,599us-gaap_ProfitLoss	28,556us-gaap_ProfitLoss	11,849us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests	1,139us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1,774us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1,935us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	688us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	339us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	233us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	552us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	163us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	5,536us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1,287us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(1,614)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Comfort Systems USA, Inc.	10,682us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	7,605us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,401us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	375us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,596us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	11,379us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	7,762us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	2,532us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	23,063us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	27,269us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	13,463us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic-
Income from continuing operations (in dollars per share)	$ 0.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.20us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.01us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.31us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.21us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.07us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.61us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.73us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.35us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income from discontinued operations (in dollars per share)											$ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare
Net income (in dollars per share)	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic
Diluted-
Income from continuing operations (in dollars per share)	$ 0.29us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.20us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.01us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.15us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.30us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.21us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.07us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.73us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.35us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income from discontinued operations (in dollars per share)											$ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
Net income (in dollars per share)	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted
Net cash provided by (used in) operating activities	5,070us-gaap_NetCashProvidedByUsedInOperatingActivities	23,881us-gaap_NetCashProvidedByUsedInOperatingActivities	22,385us-gaap_NetCashProvidedByUsedInOperatingActivities	(8,784)us-gaap_NetCashProvidedByUsedInOperatingActivities	14,641us-gaap_NetCashProvidedByUsedInOperatingActivities	27,433us-gaap_NetCashProvidedByUsedInOperatingActivities	6,700us-gaap_NetCashProvidedByUsedInOperatingActivities	(10,351)us-gaap_NetCashProvidedByUsedInOperatingActivities	42,552us-gaap_NetCashProvidedByUsedInOperatingActivities	38,423us-gaap_NetCashProvidedByUsedInOperatingActivities	30,510us-gaap_NetCashProvidedByUsedInOperatingActivities
Quarterly Results of Operations (Unaudited)
Net income after-tax	10,682us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	7,605us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,401us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	375us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,596us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	11,379us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	7,762us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	2,532us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	23,063us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	27,269us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	13,463us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net diluted income after-tax (in dollars per share)	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted
Adjustments
Quarterly Results of Operations (Unaudited)
Revenue										3,300us-gaap_SalesRevenueNet / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net income attributable to Comfort Systems USA, Inc.										1,300us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Quarterly Results of Operations (Unaudited)
Net income after-tax										$ 1,300us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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