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Contracts in Process (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Contracts in Process [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 64,690us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear $ 44,609us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings on uncompleted contracts (33,039)us-gaap_BillingsInExcessOfCostCurrent (38,121)us-gaap_BillingsInExcessOfCostCurrent
Net Costs And Estimated Earnings In Excess Of Billings $ 31,651myrg_NetCostsAndEstimatedEarningsInExcessOfBillings $ 6,488myrg_NetCostsAndEstimatedEarningsInExcessOfBillings