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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 520,086 us-gaap_Assets | $ 525,422 us-gaap_Assets
T&D [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 190,105 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember | 208,777 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember
C&I [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 69,640 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember | 62,805 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember
Other [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 260,341 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 253,840 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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- Details
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