2.2.0.25falsefalse0201 - Disclosure - Nature of Operationstruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000105634duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0eme_NatureOfOperationsAbstractemefalsenadurationNature Of Operations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNature Of Operations.falsefalseNature of Operations [Abstract]3false0us-gaap_NatureOfOperationsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00  <div align="left" style="margin-left: 0%">  <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 12pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b><font style="font-family: 'Times New Roman', Times"> <font style="font-size: 10pt"> </font></font></b> </div> <div style="margin-top: 18pt; font-size: 1pt">  </div> <table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"> <tr> <td width="8%"></td> <td width="92%"></td> </tr> <tr valign="top"> <td> <b><font style="font-family: 'Times New Roman', Times">NOTE 1—</font></b> </td> <td> <b><font style="font-family: 'Times New Roman', Times">NATURE OF OPERATIONS</font></b> </td> </tr> </table> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> References to the “Company,” “EMCOR,” “we,” “us,” “our” and similar words refer to EMCOR Group, Inc. and its consolidated subsidiaries unless the context indicates otherwise. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> We are one of the largest electrical and mechanical construction and facilities services firms in the United States, Canada, the United Kingdom and in the world. We specialize principally in providing construction services relating to electrical and mechanical systems in facilities of all types and in providing comprehensive services for the operation, maintenance and management of substantially all aspects of such facilities, commonly referred to as “facilities services.” We design, integrate, install, <font style="white-space: nowrap">start-up,</font> operate and maintain various electrical and mechanical systems, including: (a) electric power transmission and distribution systems; (b) premises electrical and lighting systems; (c) low-voltage systems, such as fire alarm, security and process control systems; (d) voice and data communication systems; (e) roadway and transit lighting and fiber optic lines; (f) heating, ventilation, air conditioning, refrigeration and clean-room process ventilation systems; (g) fire protection systems; (h) plumbing, process and high-purity piping systems; (i) water and wastewater treatment systems; and (j) central plant heating and cooling systems. We provide electrical and mechanical construction services and facilities services directly to corporations, municipalities and other governmental entities, owners/developers and tenants of buildings. We also provide these services indirectly by acting as a subcontractor to general contractors, systems suppliers and other subcontractors. Electrical and mechanical construction services generally fall into one of two categories: (a) large installation projects with contracts often in the multi-million dollar range that involve construction of industrial and commercial buildings and institutional and public works facilities or the fit-out of large blocks of space within commercial buildings and (b) smaller installation projects typically involving fit-out, renovation and retrofit work. Our facilities services operations, which support the operation of a customer’s facilities, include: (a) industrial maintenance and services; (b) outage services to utilities and industrial plants; (c) commercial and government site-based operations and maintenance; (d) military base operations support services; (e) mobile maintenance and services; (f) facilities management; (g) installation and support for building systems; (h) program development, management and maintenance for energy systems; (i) shop and <font style="white-space: nowrap">on-site</font> field services for refineries and petrochemical plants; (j) technical consulting and diagnostic services; (k) infrastructure and building projects for federal, state and local governmental agencies and bodies; (l) small modification and retrofit projects; and (m) retrofit projects to comply with clean air laws. These services are provided to a wide range of commercial, industrial, utility and institutional facilities including those at which we provided construction services. </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescribes the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Disclosures about the nature of operations need not be quantified; relative importance could be conveyed by use of terms such as "predominately", "about equally", or "major and other". This element is also referred to as "Business Description".Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 10 falsefalseNATURE OF OPERATIONS12Nature of OperationsUnKnownUnKnownUnKnownUnKnownfalsetrue