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Commitments and Contingencies (Details 3) (USD $)	Dec. 31, 2014
Workers Compensation
Self-Insurance
Per incident deductible amount	$ 500,000fix_SelfInsuranceDeductibleAmountPerIncident / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_WorkersCompensationMember
Amount of loss fully insured above per incident deductible amount.	500,000fix_SelfInsuranceAmountOfLossFullyInsuredAboveDeductibleCoverageAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_WorkersCompensationMember
Employer's Liability, General Liability and Auto Liability | Maximum
Self-Insurance
Amount of excess loss insurance covered	100,000,000fix_SelfInsuranceAggregateLossInsuranceCoveredAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_EmployersLiabilityGeneralLiabilityAndAutoLiabilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Employer's Liability
Self-Insurance
Per incident deductible amount	500,000fix_SelfInsuranceDeductibleAmountPerIncident / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_EmployersLiabilityMember
Amount of loss fully insured above per incident deductible amount.	500,000fix_SelfInsuranceAmountOfLossFullyInsuredAboveDeductibleCoverageAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_EmployersLiabilityMember
General Liability
Self-Insurance
Per incident deductible amount	500,000fix_SelfInsuranceDeductibleAmountPerIncident / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GeneralLiabilityMember
Amount of loss fully insured above per incident deductible amount.	1,500,000fix_SelfInsuranceAmountOfLossFullyInsuredAboveDeductibleCoverageAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GeneralLiabilityMember
Auto Liability
Self-Insurance
Per incident deductible amount	500,000fix_SelfInsuranceDeductibleAmountPerIncident / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_AutoLiabilityMember
Amount of loss fully insured above per incident deductible amount.	1,500,000fix_SelfInsuranceAmountOfLossFullyInsuredAboveDeductibleCoverageAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_AutoLiabilityMember
Employee Medical
Self-Insurance
Number of medical plans	2fix_SelfInsuranceNumberOfMedicalPlans / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_EmployeeMedicalMember
Employee Medical- Plan One
Self-Insurance
Per person, per policy deductible amount	350,000fix_SelfInsuranceDeductibleAmountPerPersonPerPolicy / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_EmployeeMedicalPlanOneMember
Employee Medical- Plan Two
Self-Insurance
Per person, per policy deductible amount	$ 350,000fix_SelfInsuranceDeductibleAmountPerPersonPerPolicy / us-gaap_LossContingenciesByNatureOfContingencyAxis = fix_EmployeeMedicalPlanTwoMember

X

- Definition

Represents the amount of aggregate excess loss coverage above applicable per-incident deductibles for all lines of risk.

+ References

No definition available.

+ Details

Name:	fix_SelfInsuranceAggregateLossInsuranceCoveredAmount
Namespace Prefix:	fix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of loss fully insured above per incident deductible amount under insurance arrangements under various risks.

+ References

No definition available.

+ Details

Name:	fix_SelfInsuranceAmountOfLossFullyInsuredAboveDeductibleCoverageAmount
Namespace Prefix:	fix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of risk retained by the entity per incident before the insurance arrangement begins to provide coverage under various risks.

+ References

No definition available.

+ Details

Name:	fix_SelfInsuranceDeductibleAmountPerIncident
Namespace Prefix:	fix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of risk retained by the entity per person, per policy before the insurance arrangement begins to provide coverage under various risks.

+ References

No definition available.

+ Details

Name:	fix_SelfInsuranceDeductibleAmountPerPersonPerPolicy
Namespace Prefix:	fix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of medical plans.

+ References

No definition available.

+ Details

Name:	fix_SelfInsuranceNumberOfMedicalPlans
Namespace Prefix:	fix_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_AutoLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_EmployeeMedicalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_EmployeeMedicalPlanOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_EmployeeMedicalPlanTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_EmployersLiabilityGeneralLiabilityAndAutoLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_EmployersLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=fix_WorkersCompensationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_GeneralLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: