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Stock-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Other information |  |  |  |
Allocated Share-based Compensation Expense | $ 4.7 us-gaap_AllocatedShareBasedCompensationExpense | $ 3.5 us-gaap_AllocatedShareBasedCompensationExpense | $ 2.9 us-gaap_AllocatedShareBasedCompensationExpense |
Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercisable period from date of grant | 10 years |  |  |
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | 0.6 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Weighted average vesting period | 10 months 24 days |  |  |
Maximum [Member] | Stock Option [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 4 years |  |  |
Minimum [Member] | Stock Option [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 3 years |  |  |
Long-Term Incentive Plan [Member] |  |  |  |
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | 6.2 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = myrg_LongtermIncentivePlanMember |  |  |
Long-Term Incentive Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum Grants Of Awards (in shares) | 4,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = myrg_LongtermIncentivePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Total Shareholder Return [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 30.66 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_TradingActivityByTypeAxis = myrg_TotalShareholderReturnMember |  |  |
Total Shareholder Return [Member] | Performance Period Prior To January 01 2014 [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Period | 20 days |  |  |
Total Shareholder Return [Member] | Prior to December 31 2016 [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Period | 20 days |  |  |
Return On Invested Capital [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 24.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_TradingActivityByTypeAxis = myrg_ReturnOnInvestedCapitalMember |  |  |
Restricted Stock [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 22.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 21.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 19.54 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 21.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | 3.2 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Weighted average vesting period | 2 years 1 month 6 days |  |  |
Restricted Stock [Member] | Eligible of the Board of Directors [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 3 years |  |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 5 years |  |  |
Restricted Stock [Member] | Minimum [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 3 years |  |  |
Performance awards [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Shares earned by the participants | 65,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 45,116 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 30,855 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Target awards earned during the performance period (as a percent) | 163.30%myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardsEarned / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 133.30%myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardsEarned / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 76.60%myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardsEarned / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 26.63 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 21.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 20.51 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 20.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | $ 2.5 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Weighted average vesting period | 1 year 7 months 6 days |  |  |
Performance awards [Member] | Maximum [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Potential Payout As a Percentage of Target Shares | 200.00%myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPotentialPayoutAsPercentageOfTargetShares / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Performance awards [Member] | Minimum [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Potential Payout As a Percentage of Target Shares | 0.00%myrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPotentialPayoutAsPercentageOfTargetShares / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |

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