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Revenue Recognition (Details 3) $ in Thousands	Sep. 30, 2018 USD ($)
Total, Remaining Performance Obligation	$ 1,018,621
Amount estimated to not be recognized within 12 months	196,234
T&D [Member]
Total, Remaining Performance Obligation	403,046
Amount estimated to not be recognized within 12 months	63,683
C&I [Member]
Total, Remaining Performance Obligation	615,575
Amount estimated to not be recognized within 12 months	$ 132,551

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue within 12 months.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
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X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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