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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 item
Commitments and Contingencies |
Deductible per claim for each line of coverage, until claim aggregate is reached | $ 1.0
Deductible per claim, once a policy's claim aggregate is reached per line of coverage | 0.5
Deductible under health insurance benefits for qualified individuals | 0.1
Number of multi-employer pension plans, the withdrawal of which could result in assessment of liabilities for additional contributions related to the underfunding of plans, minimum | 1
Surety bonds |
Commitments and Contingencies |
Aggregate original face amount of outstanding bonds issued by the surety | 944.8
Estimated remaining cost to complete bonded projects | $ 250.5

X
- Definition Estimated cost to complete bonded projects. + References No definition available. + Details
Name: | myrg_EstimatedCostToCompleteBondedProjects
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of deductible under health insurance benefits for qualified individuals. + References No definition available. + Details
Name: | myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of deductible up to the claim aggregate under insurance arrangements, for each line of coverage excluding auto liability and medical insurance. + References No definition available. + Details
Name: | myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverage
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of deductible under insurance arrangements, once the policy's claim aggregate is reached for each line of coverage, excluding medical insurance. + References No definition available. + Details
Name: | myrg_LossContingencyInsurancePolicyDeductibleIfClaimAggregateReachedPerLineOfCoverage
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the minimum number of multi-employer pension plans from the withdrawal of which a subsidiary could be assessed for liabilities for additional contributions related to the underfunding of plans. + References No definition available. + Details
Name: | myrg_NumberOfMultiemployerPlansWithdrawalThatCouldResultInAssessmentOfAdditionalContributionLiabilitiesRelatedToUnderfundingOfPlansMinimum
Namespace Prefix: | myrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of outstanding performance bonds. + References No definition available. + Details
Name: | myrg_OutstandingPerformanceBonds
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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