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Acquisitions (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2014 item	Dec. 31, 2014	Dec. 31, 2013
Acquisitions
Goodwill on acquisition	$ 143,569,000us-gaap_Goodwill		$ 140,341,000us-gaap_Goodwill	$ 114,588,000us-gaap_Goodwill
Number of acquisitions	2us-gaap_NumberOfBusinessesAcquired	1us-gaap_NumberOfBusinessesAcquired
Dyna Ten
Acquisitions
Total purchase price	40,500,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fix_DynaTenCorporationMember
Goodwill on acquisition	19,800,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fix_DynaTenCorporationMember
Other Acquisitions
Acquisitions
Total purchase price	$ 6,700,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember	$ 1,500,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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The number of businesses acquired by the entity during the period.

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