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Organization, Business and Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Insurance |  |  |
Deductible for each line of coverage | $ 1.0 |  |
Deductible under health insurance benefits for qualified individuals | 0.1 |  |
Goodwill and Intangible Assets |  |  |
Impairment charges | $ 0 | $ 0 | $ 0

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 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

X
- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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