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Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014
Options Outstanding
Number Of Options (in shares)	1,008,781us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Weighted-Average Exercise Price (in dollars per share)	$ 13.87us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Weighted-Average Remaining Contractual Term	4 years 2 months 12 days
Options Exercisable
Number Of Options (in shares)	879,024us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Weighted-Average Exercise Price (in dollars per share)	$ 12.72us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Range Of Exercise Prices From Dollars 3.65 To 9.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 3.65us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsThreePointSixFiveToNineMember
Exercise price, high end of range (in dollars per share)	$ 9.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsThreePointSixFiveToNineMember
Options Outstanding
Number Of Options (in shares)	248,861us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsThreePointSixFiveToNineMember
Weighted-Average Exercise Price (in dollars per share)	$ 3.73us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsThreePointSixFiveToNineMember
Weighted-Average Remaining Contractual Term	1 year 6 months
Options Exercisable
Number Of Options (in shares)	248,861us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsThreePointSixFiveToNineMember
Weighted-Average Exercise Price (in dollars per share)	$ 3.73us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsThreePointSixFiveToNineMember
Range Of Exercise Prices From Dollars 9.01 To 18.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 9.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsNinePointZeroOneToEieghteenMember
Exercise price, high end of range (in dollars per share)	$ 18.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsNinePointZeroOneToEieghteenMember
Options Outstanding
Number Of Options (in shares)	551,740us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsNinePointZeroOneToEieghteenMember
Weighted-Average Exercise Price (in dollars per share)	$ 14.66us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsNinePointZeroOneToEieghteenMember
Weighted-Average Remaining Contractual Term	4 years 2 months 12 days
Options Exercisable
Number Of Options (in shares)	505,564us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsNinePointZeroOneToEieghteenMember
Weighted-Average Exercise Price (in dollars per share)	$ 14.40us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsNinePointZeroOneToEieghteenMember
Range Of Exercise Prices From Dollars 18.01 To 24.68
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 18.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsEieghteenPointZeroOneToTwentyFourPointSixEieghtMember
Exercise price, high end of range (in dollars per share)	$ 24.68us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsEieghteenPointZeroOneToTwentyFourPointSixEieghtMember
Options Outstanding
Number Of Options (in shares)	208,180us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsEieghteenPointZeroOneToTwentyFourPointSixEieghtMember
Weighted-Average Exercise Price (in dollars per share)	$ 23.90us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsEieghteenPointZeroOneToTwentyFourPointSixEieghtMember
Weighted-Average Remaining Contractual Term	7 years 3 months 18 days
Options Exercisable
Number Of Options (in shares)	124,599us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsEieghteenPointZeroOneToTwentyFourPointSixEieghtMember
Weighted-Average Exercise Price (in dollars per share)	$ 23.87us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = myrg_RangeOfExercisePricesFromDollarsEieghteenPointZeroOneToTwentyFourPointSixEieghtMember

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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