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Organization, Business and Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2014 item
Organization, Business and Basis of Presentation
Number of business segments	2
Use of Estimates
Additional gross margin recognized as the result of revised cost estimates on transmission projects (as a percent)	1.70%

X

- Definition

Increase in gross margin percentage recognized as a result of revised cost estimates.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
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