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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant multiemployer plans |  |  |
Contributions to Plan | $ 44,824,000 us-gaap_MultiemployerPlanPeriodContributions | $ 43,887,000 us-gaap_MultiemployerPlanPeriodContributions | $ 39,763,000 us-gaap_MultiemployerPlanPeriodContributions
National Electrical Benefit Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 6,330,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalBenefitFundMember | 6,048,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalBenefitFundMember | 5,731,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalBenefitFundMember
Minimum future contributions (as a percent) | 3.00%myrg_MultiemployerPlansMinimumContributionAsPercentOfWages / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalBenefitFundMember |  |
National Electrical Annuity Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 20,694,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalAnnuityPlanMember | 21,002,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalAnnuityPlanMember | 17,081,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_NationalElectricalAnnuityPlanMember
Eighth District Electrical Pension Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 5,197,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundMember | 5,672,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundMember | 3,733,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundMember
Minimum future contributions (in dollars per hour) | 1.71 us-gaap_MultiemployerPlansMinimumContribution / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundMember |  |
IBEW Local 1249 Pension Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 2,103,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_IbewLocal1249PensionPlanMember | 3,147,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_IbewLocal1249PensionPlanMember | 3,679,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_IbewLocal1249PensionPlanMember
Minimum future contributions (in dollars per hour) | 9.60 us-gaap_MultiemployerPlansMinimumContribution / us-gaap_MultiemployerPlanNameAxis = myrg_IbewLocal1249PensionPlanMember |  |
Eighth District Electrical Pension Fund Annuity Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 3,553,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundAnnuityPlanMember | 2,427,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundAnnuityPlanMember | 2,560,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = myrg_EighthDistrictElectricalPensionFundAnnuityPlanMember
Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | $ 6,947,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember | $ 5,591,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember | $ 6,979,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember

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- Definition Amount of minimum contribution(s) as a percent of wages required for future periods to a multiemployer plan by collective bargaining arrangements, statutory obligations, or other contractual obligations. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Amount of minimum contribution(s) required for future periods to a multiemployer plan by collective bargaining arrangements, statutory obligations, or other contractual obligations. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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