XML 28 R32.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Acquisitions Of Businesses (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Business Acquisition [Line Items] |  |
Non-cash income from contingent consideration arrangements | $ 0.2 eme_NonCashIncomeExpenseFromContingentConsiderationArrangements | $ 0 eme_NonCashIncomeExpenseFromContingentConsiderationArrangements

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
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration