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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified | 1 Months Ended
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Sep. 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
Vehicular traffic accident |
Commitments and Contingencies |
Reserve for legal settlements | 2.3
L.E. Myers Co | Vehicular traffic accident |
Commitments and Contingencies |
Compensatory damages | 0.7
Punitive damages | 3.6
Maximum number of times of compensatory damages for estimated punitive damages | 3
Maximum estimated punitive damage awards | 2.0
Surety bonds |
Commitments and Contingencies |
Aggregate original face amount of outstanding bonds issued by the surety | 901.1
Estimated remaining cost to complete bonded projects | $ 236.7

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 the compensatory damages award that was returned against the defendants in the legal matter. + References No definition available. + Details
Name: | myrg_LossContingencyCompensatoryDamagesAwardedValue
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the maximum estimated amount of the punitive damages award that can be sought by the plaintiff in the legal matter. + References No definition available. + Details
Name: | myrg_LossContingencyEstimatedPunitiveDamagesThatCanBeSoughtMaximum
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 maximum multiple of compensatory damages the entity believes is supported by Florida law. + References No definition available. + Details
Name: | myrg_LossContingencyMaximumMultipleOfCompensatoryDamagesForEstimatedPunitiveDamagesThatCanBeSought
Namespace Prefix: | myrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of the proposed punitive damage awards issued in a legal judgment. + References No definition available. + Details
Name: | myrg_LossContingencyPunitiveDamagesAwardedValue
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- Definition Represents the amount of reserve established for expense relating to settlement of litigation. + References No definition available. + Details
Name: | myrg_ReserveForLegalSettlements
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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