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Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012
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	7 years

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