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Organization, Business and Significant Accounting Policies (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | $ 58,404,000 us-gaap_OperatingIncomeLoss | $ 55,617,000 us-gaap_OperatingIncomeLoss | $ 55,762,000 us-gaap_OperatingIncomeLoss
Net Income (Loss) Attributable to Parent | 14,127,000 us-gaap_NetIncomeLoss | 8,404,000 us-gaap_NetIncomeLoss | 7,741,000 us-gaap_NetIncomeLoss | 6,272,000 us-gaap_NetIncomeLoss | 10,022,000 us-gaap_NetIncomeLoss | 8,315,000 us-gaap_NetIncomeLoss | 9,462,000 us-gaap_NetIncomeLoss | 6,960,000 us-gaap_NetIncomeLoss | 36,544,000 us-gaap_NetIncomeLoss | 34,759,000 us-gaap_NetIncomeLoss | 34,262,000 us-gaap_NetIncomeLoss
Earnings Per Share, Diluted | $ 0.66 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 1.69 us-gaap_EarningsPerShareDiluted | $ 1.61 us-gaap_EarningsPerShareDiluted | $ 1.60 us-gaap_EarningsPerShareDiluted
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 us-gaap_NumberOfReportableSegments |  |
Advertising Expense |  |  |  |  |  |  |  |  | 400,000 us-gaap_AdvertisingExpense | 300,000 us-gaap_AdvertisingExpense | 500,000 us-gaap_AdvertisingExpense
Percentage Of Retainage Recorded And Collected Within One Year |  |  |  |  |  |  |  |  | 90.00%myrg_PercentageOfRetainageRecordedAndCollectedWithinOneYear |  |
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Health | 1,000,000 myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth |  |  |  |  |  |  |  | 1,000,000 myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth |  |
Loss Contingency Health Insurance Deductible For Qualified Individuals | 100,000 myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals |  |  |  |  |  |  |  | 100,000 myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals |  |
Accounts Receivable [Member] | Number of Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember |
Accounts Receivable [Member] | Number of Customers [Member] | Credit Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 14.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember | 14.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember |
Number Of Customers Individually Exceeding Ten Percent Consolidated Accounts Receivable |  |  |  |  |  |  |  |  | 1 myrg_NumberOfCustomersIndividuallyExceedingTenPercentConsolidatedAccountsReceivable / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember | 1 myrg_NumberOfCustomersIndividuallyExceedingTenPercentConsolidatedAccountsReceivable / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember |
Revenues [Member] | Number of Customers [Member] | Customer concentration risk [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  | 15.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember
Number Of Customers Individually Exceeding Ten Percent Consolidated Revenues |  |  |  |  |  |  |  |  |  |  | 1 myrg_NumberOfCustomersIndividuallyExceedingTenPercentConsolidatedRevenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_NumberOfCustomersMember
Revenues [Member] | Top Ten Customers [Member] | Customer concentration risk [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 46.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_TopTenLargestCustomerMember | 57.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_TopTenLargestCustomerMember | 59.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = myrg_TopTenLargestCustomerMember
Labor employees covered by collective bargaining agreements [Member] | Labor Force Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 91.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LaborForceConcentrationRiskMember |  |
Contracts Accounted for under Percentage of Completion [Member] | Cost Estimate Revision [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost Estimate Revision Gross Margin Increase Percentage |  |  |  |  |  |  |  |  | 1.90%myrg_CostEstimateRevisionGrossMarginIncreasePercentage / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_ConcentrationRiskByBenchmarkAxis = myrg_CostEstimateRevisionMember | 0.80%myrg_CostEstimateRevisionGrossMarginIncreasePercentage / us-gaap_ChangeInAccountingEstimateByTypeAxis = us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember / us-gaap_ConcentrationRiskByBenchmarkAxis = myrg_CostEstimateRevisionMember |
Estimate Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 18,400,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = myrg_EstimateAdjustmentMember | 7,700,000 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = myrg_EstimateAdjustmentMember |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  | $ 11,600,000 us-gaap_NetIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = myrg_EstimateAdjustmentMember | $ 4,900,000 us-gaap_NetIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = myrg_EstimateAdjustmentMember |
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 0.54 us-gaap_EarningsPerShareDiluted / us-gaap_ChangeInAccountingEstimateByTypeAxis = myrg_EstimateAdjustmentMember | $ 0.23 us-gaap_EarningsPerShareDiluted / us-gaap_ChangeInAccountingEstimateByTypeAxis = myrg_EstimateAdjustmentMember |

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