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Lease Obligations (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total	$ 4.6
Master Lease Obligations	$ 0.3
Maximum [Member]
Operating Lease Remaining Term	5 years
Minimum [Member]
Operating Lease Remaining Term	1 year

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term, net of payments or other amounts applied to the principal through the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the remaining term of the operating lease arrangements of the entity.

+ References

No definition available.

+ Details

Name:	myrg_OperatingLeaseRemainingTerm
Namespace Prefix:	myrg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ 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:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: