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Income Taxes (Details 1)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Differences between the U.S. federal statutory rate and the Company's effective tax rate for continuing operations
U.S federal statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of U.S. federal income tax expense	3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	3.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	3.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Provision to return adjustments, net	0.20%myrg_EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsNet	(0.30%)myrg_EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsNet	(0.20%)myrg_EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsNet
Domestic production/manufacturing deduction	(2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Non-deductible meals and entertainment	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment
Research and development credit	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Other, net	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective rate	36.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations	36.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to provision to return adjustments.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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