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Goodwill and Identifiable Intangible Assets, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in the carrying amount of goodwill
Balance at the beginning of period	$ 114,588us-gaap_Goodwill	$ 114,588us-gaap_Goodwill
Additions	26,480us-gaap_GoodwillAcquiredDuringPeriod
Impairment adjustment	(727)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Balance at the end of period	$ 140,341us-gaap_Goodwill	$ 114,588us-gaap_Goodwill	$ 114,588us-gaap_Goodwill
Income valuation approach using discounted cash flow model
Changes in the carrying amount of goodwill
Weighting percentage			50.00%fix_FairValueAssumptionWeightPercentageAssigned / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Public company market approach
Changes in the carrying amount of goodwill
Weighting percentage			40.00%fix_FairValueAssumptionWeightPercentageAssigned / us-gaap_ValuationTechniqueAxis = fix_PublicCompanyMarketApproachValuationTechniqueMember
Weight assigned to the public company approach for impacted reporting units, percentage			50.00%fix_FairValueAssumptionWeightPercentageAssignedForImpactedReportingUnits / us-gaap_ValuationTechniqueAxis = fix_PublicCompanyMarketApproachValuationTechniqueMember
Transaction approach
Changes in the carrying amount of goodwill
Weighting percentage			10.00%fix_FairValueAssumptionWeightPercentageAssigned / us-gaap_ValuationTechniqueAxis = fix_TransactionMarketApproachValuationTechniqueMember
Weight assigned to the transaction approach due to the lack of comparable market data, percentage			0.00%fix_FairValueAssumptionWeightPercentageAssignedDueToLackOfComparableMarketData / us-gaap_ValuationTechniqueAxis = fix_TransactionMarketApproachValuationTechniqueMember

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- Definition

Represents the weighting percentage assigned to valuation approach.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

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