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

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=myrg_TdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: