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

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- 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

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- 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