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Schedule of Restructuring Activities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | $ 239 us-gaap_RestructuringReserve | $ 324 us-gaap_RestructuringReserve | $ 281 us-gaap_RestructuringReserve | $ 194 us-gaap_RestructuringReserve
Restructuring expenses | 8 us-gaap_RestructuringCharges | 225 us-gaap_RestructuringCharges |  |
Payments for restructuring | (50)us-gaap_PaymentsForRestructuring | (95)us-gaap_PaymentsForRestructuring |  |
Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 6 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |
Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 2 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember | 225 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |
Corporate, Non-Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 0 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 300 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Restructuring expenses | 0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 300 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |
Payments for restructuring | 0 us-gaap_PaymentsForRestructuring / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_PaymentsForRestructuring / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |
Corporate, Non-Segment [Member] | Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |
Corporate, Non-Segment [Member] | Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 239 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 24 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 255 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 30 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US
Restructuring expenses | 2 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |
Payments for restructuring | (18)us-gaap_PaymentsForRestructuring / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | (6)us-gaap_PaymentsForRestructuring / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 0 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 0 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 26 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | 164 us-gaap_RestructuringReserve / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US
Restructuring expenses | 6 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |  |
Reversal of restructuring expenses |  | (75)eme_ReversalofRestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |
Payments for restructuring | (32)us-gaap_PaymentsForRestructuring / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US | (89)us-gaap_PaymentsForRestructuring / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 6 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 2 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | $ 0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember / us-gaap_StatementGeographicalAxis = country_US |  |  |

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