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Disposition of Assets (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |  |
Proceeds from sale of subsidiary | $ 0 us-gaap_ProceedsFromDivestitureOfBusinesses | $ 1,121 us-gaap_ProceedsFromDivestitureOfBusinesses |  |
Loss on sale of subsidiary | 0 us-gaap_GainLossOnSaleOfBusiness | 596 us-gaap_GainLossOnSaleOfBusiness |  |
Loss from discontinued operation, net of income taxes | (355)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (2,041)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |
From discontinued operation (in US dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |
Restructuring reserve | 239 us-gaap_RestructuringReserve | 324 us-gaap_RestructuringReserve | 281 us-gaap_RestructuringReserve | 194 us-gaap_RestructuringReserve
United Kingdom Construction [Member] |  |  |  |
Income Statement [Abstract] |  |  |  |
Revenues | 276 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember | 8,846 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  |
Loss from discontinued operation, net of income taxes | (355)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember | (2,041)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  |
From discontinued operation (in US dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  |
Restructuring reserve | 1,100 us-gaap_RestructuringReserve / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  |  |
Assets of discontinued operation: |  |  |  |
Current assets | 4,198 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  | 6,265 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |
Non-current assets | 138 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  | 278 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |
Liabilities of discontinued operation: |  |  |  |
Current liabilities | 9,014 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  | 10,743 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |
Non-current liabilities | 43 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |  | 94 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedKingdomConstructionMember |
United States Building Services [Member] | United States Building Services Subsidiary [Member] |  |  |  |
Income Statement [Abstract] |  |  |  |
Proceeds from sale of subsidiary |  | 1,100 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedStatesBuildingServicesSubsidiaryMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesBuildingServicesMember |  |
Selling, General and Administrative Expenses [Member] | United States Building Services [Member] | United States Building Services Subsidiary [Member] |  |  |  |
Income Statement [Abstract] |  |  |  |
Loss on sale of subsidiary |  | $ 600 us-gaap_GainLossOnSaleOfBusiness / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = eme_UnitedStatesBuildingServicesSubsidiaryMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementBusinessSegmentsAxis = eme_UnitedStatesBuildingServicesMember |  |

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