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Organization, Business and Significant Accounting Policies (Details 2) | 12 Months Ended
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Dec. 31, 2013 item
Property and Equipment |
Number of new construction equipment leases entered | 0
Maximum |
Property and Equipment |
Real estate lease term | 10 years
Buildings and improvements, including land improvements | Minimum |
Property and Equipment |
Estimated useful lives | 3 years
Buildings and improvements, including land improvements | Maximum |
Property and Equipment |
Estimated useful lives | 39 years
Construction equipment | Minimum |
Property and Equipment |
Estimated useful lives | 2 years
Construction equipment | Maximum |
Property and Equipment |
Estimated useful lives | 12 years
Office equipment | Minimum |
Property and Equipment |
Estimated useful lives | 3 years
Office equipment | Maximum |
Property and Equipment |
Estimated useful lives | 8 years

X
- Definition Represents the number of new construction equipment leases entered into during the period. + References No definition available. + Details
Name: | myrg_NumberOfConstructionEquipmentLeasesEntered
Namespace Prefix: | myrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the real estate maximum lease term. + References No definition available. + Details
Name: | myrg_RealEstateLeaseTerm
Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration