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Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 33,423us-gaap_DepreciationDepletionAndAmortization $ 29,195us-gaap_DepreciationDepletionAndAmortization $ 25,156us-gaap_DepreciationDepletionAndAmortization
T&D [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization 30,957us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= myrg_TdMember
27,545us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= myrg_TdMember
23,758us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= myrg_TdMember
C&I [Member]      
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 2,466us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= myrg_CiMember
$ 1,650us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= myrg_CiMember
$ 1,398us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= myrg_CiMember