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Summary of Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Insurance
Deductible for each line of coverage	$ 1.0
Deductible for policies whose claim aggregate reaches per line of coverage	0.5
Deductible under health insurance benefits for qualified individuals	$ 0.1

X

- Definition

Represents the amount of deductible under health insurance benefits for qualified individuals.

+ References

No definition available.

+ Details

Name:	myrg_HealthInsuranceDeductibleForQualifiedIndividuals
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of deductible for policies whose claim aggregate reaches per line of coverage.

+ References

No definition available.

+ Details

Name:	myrg_InsurancePoliciesDeductibleIfClaimAggregateReachesPerLineOfCoverage
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of risk retained by the entity per claim before the insurance arrangement begins to provide coverage for each line of coverage under insurance arrangements.

+ References

No definition available.

+ Details

Name:	myrg_InsurancePoliciesDeductiblePerClaimForEachLineOfCoverage
Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	myrg_InsurancePoliciesLineItems
Namespace Prefix:	myrg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration