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Contracts in Process (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Contracts in Process [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 44,609us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear $ 40,519us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings on uncompleted contracts (38,121)us-gaap_BillingsInExcessOfCostCurrent (52,952)us-gaap_BillingsInExcessOfCostCurrent
Net Costs And Estimated Earnings In Excess Of Billings $ 6,488myrg_NetCostsAndEstimatedEarningsInExcessOfBillings $ (12,433)myrg_NetCostsAndEstimatedEarningsInExcessOfBillings