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Commitments and Contingencies (Details Textual 2) $ in Millions	Jun. 30, 2016 USD ($)
Other Commitments [Line Items]
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Health	$ 1.0
Loss Contingency Health Insurance Deductible For Qualified Individuals	0.1
Outstanding Performance Bonds	870.5
Estimated Cost to Complete Bonded Projects	$ 105.1

X

- Definition

Estimated cost to complete bonded projects.

+ References

No definition available.

+ Details

Name:	myrg_EstimatedCostToCompleteBondedProjects
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of deductible under health insurance benefits for qualified individuals.

+ References

No definition available.

+ Details

Name:	myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of deductible up to the claim aggregate under insurance arrangements, for each line of coverage excluding auto liability and medical insurance, excluding health insurance.

+ References

No definition available.

+ Details

Name:	myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The total amount of outstanding performance bonds.

+ References

No definition available.

+ Details

Name:	myrg_OutstandingPerformanceBonds
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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