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Commitments and Contingencies (Details Textual 2) (USD $)
 1 Months Ended
Apr. 30, 2015
Jan. 31, 2013
Mar. 31, 2015
Other Commitments [Line Items]      
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Health     $ 1,000,000myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth
Loss Contingency Health Insurance Deductible For Qualified Individuals     100,000myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals
Outstanding Performance Bonds     823,500,000myrg_OutstandingPerformanceBonds
Estimated Cost to Complete Bonded Projects     113,700,000myrg_EstimatedCostToCompleteBondedProjects
LE Myers Co [Member] | Subsequent Event [Member]      
Other Commitments [Line Items]      
Litigation Settlement, Amount $ 230,000us-gaap_LitigationSettlementAmount
/ dei_LegalEntityAxis
= myrg_LeMyersCoMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] | Minimum [Member]      
Other Commitments [Line Items]      
Period During Which Defendant Operated Manufactured Gas Plant   6 years  
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] | Maximum [Member]      
Other Commitments [Line Items]      
Period During Which Defendant Operated Manufactured Gas Plant   12 years