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Business and Organization (Details)	12 Months Ended
	Dec. 31, 2014
Installation of systems in newly constructed facilities
Business and Organization
Percentage of revenue attributable to services	44.00%fix_SalesRevenueServicesNetPercentage / us-gaap_ProductOrServiceAxis = fix_SystemInstallationInNewlyConstructedFacilitiesMember
Maintenance, repair and replacement services
Business and Organization
Percentage of revenue attributable to services	56.00%fix_SalesRevenueServicesNetPercentage / us-gaap_ProductOrServiceAxis = fix_MaintenanceRepairAndReplacementServiceMember
HVAC
Business and Organization
Percentage of revenue attributable to services	74.00%fix_SalesRevenueServicesNetPercentage / us-gaap_ProductOrServiceAxis = fix_HeatingVentilationAndAirConditioningMember
Plumbing
Business and Organization
Percentage of revenue attributable to services	16.00%fix_SalesRevenueServicesNetPercentage / us-gaap_ProductOrServiceAxis = fix_PlumbingMember
Building automation control systems
Business and Organization
Percentage of revenue attributable to services	6.00%fix_SalesRevenueServicesNetPercentage / us-gaap_ProductOrServiceAxis = fix_BuildingAutomationControlSystemsMember
Other
Business and Organization
Percentage of revenue attributable to services	4.00%fix_SalesRevenueServicesNetPercentage / us-gaap_ProductOrServiceAxis = fix_OtherServicesMember

X

- Definition

The percentage of net services revenue to total net revenue from the services rendered as of the year end.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: