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

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