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Acquisitions Of Businesses (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) Company | Mar. 31, 2015 USD ($) Company
Business Acquisition [Line Items] |  |
Number of businesses acquired | Company | 0 | 0
Non-cash income from contingent consideration arrangements | $ | $ 0.0 | $ 0.2

X
- Definition Non-cash income (expense) from acquisition related contingent consideration arrangements. + References No definition available. + Details
Name: | eme_NonCashIncomeExpenseFromContingentConsiderationArrangements
Namespace Prefix: | eme_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration