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Commitments and Contingencies (Details 2) (Surety)	12 Months Ended
	Dec. 31, 2014
Minimum
Surety
Percentage of business which has required bonds	25.00%fix_PercentageOfBusinessWhichHasRequiredBonds / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_SuretyBondMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Surety
Percentage of business which has required bonds	35.00%fix_PercentageOfBusinessWhichHasRequiredBonds / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_SuretyBondMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Details

Name:	fix_LossContingencySuretyAbstract
Namespace Prefix:	fix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of business which has required bonds.

+ References

No definition available.

+ Details

Name:	fix_PercentageOfBusinessWhichHasRequiredBonds
Namespace Prefix:	fix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration