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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Intangible Assets And Goodwill [Line Items]
Gross carrying amount of goodwill and intangible assets	$ 59,691myrg_IntangibleAssetsGrossIncludingGoodwill	$ 59,691myrg_IntangibleAssetsGrossIncludingGoodwill
Goodwill gross carrying amount	46,599us-gaap_GoodwillGross	46,599us-gaap_GoodwillGross
Accumulated Amortization	3,227us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	2,893us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Goodwill accumulated amortization	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Net carrying amount of goodwill and intangible assets	56,464us-gaap_IntangibleAssetsNetIncludingGoodwill	56,798us-gaap_IntangibleAssetsNetIncludingGoodwill
Goodwill net carrying amount	46,599us-gaap_Goodwill	46,599us-gaap_Goodwill
Intangible Assets, Gross (Excluding Goodwill)	13,092us-gaap_IntangibleAssetsGrossExcludingGoodwill	13,092us-gaap_IntangibleAssetsGrossExcludingGoodwill
Intangible Assets, Net (Excluding Goodwill)	9,865us-gaap_IntangibleAssetsNetExcludingGoodwill	10,199us-gaap_IntangibleAssetsNetExcludingGoodwill
T&D [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill gross carrying amount	40,042us-gaap_GoodwillGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_TAndDMember	40,042us-gaap_GoodwillGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_TAndDMember
Goodwill accumulated amortization	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_TAndDMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_TAndDMember
Goodwill net carrying amount	40,042us-gaap_Goodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_TAndDMember	40,042us-gaap_Goodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_TAndDMember
C&I [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill gross carrying amount	6,557us-gaap_GoodwillGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_CAndIMember	6,557us-gaap_GoodwillGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_CAndIMember
Goodwill accumulated amortization	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_CAndIMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_CAndIMember
Goodwill net carrying amount	6,557us-gaap_Goodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_CAndIMember	6,557us-gaap_Goodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = myrg_CAndIMember
Backlog
Schedule Of Intangible Assets And Goodwill [Line Items]
Accumulated Amortization	521us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember	521us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Net carrying amount of goodwill and intangible assets	521us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember	521us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Amortizable intangible assets net carrying amount	0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember	0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Customer Relationships [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizable intangible assets customer relationships gross	4,015us-gaap_FiniteLivedCustomerRelationshipsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	4,015us-gaap_FiniteLivedCustomerRelationshipsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	2,706us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	2,372us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Amortizable intangible assets net carrying amount	1,309us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	1,643us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Trade Names [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Accumulated Amortization	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Indefinite-lived intangible assets gross carrying amount	8,556us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	8,556us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Indefinite-lived intangible assets net carrying amount	$ 8,556us-gaap_IndefiniteLivedTradeNames / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	$ 8,556us-gaap_IndefiniteLivedTradeNames / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember

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Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

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