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Contracts in Process (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Contracts in Process [Line Items]
Costs and estimated earnings on uncompleted contracts	$ 1,746,507myrg_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarnings	$ 1,748,204myrg_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarnings
Less: Billings to date	1,740,019myrg_BillingsToDate	1,760,637myrg_BillingsToDate
Net Costs And Estimated Earnings In Excess Of Billings	$ 6,488myrg_NetCostsAndEstimatedEarningsInExcessOfBillings	$ (12,433)myrg_NetCostsAndEstimatedEarningsInExcessOfBillings

X

- Definition

Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the billings to date on uncompleted contracts accounted for under the percentage-of-completion method.

+ References

No definition available.

+ Details

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

X

- Details

Name:	myrg_ContractsInProcessLineItems
Namespace Prefix:	myrg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the net costs and estimated earnings in excess of billings on uncompleted contracts accounted for under the percentage-of-completion method.

+ References

No definition available.

+ Details

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