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Commitments and Contingencies (Details Textual 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2013 | Sep. 30, 2013
Other Commitments [Line Items] |  |  |  |  |
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Health | $ 1.0 myrg_LossContingencyInsurancePolicyDeductibleForEachLineOfCoverageExcludingHealth |  |  |  |
Loss Contingency Health Insurance Deductible For Qualified Individuals | 0.1 myrg_LossContingencyHealthInsuranceDeductibleForQualifiedIndividuals |  |  |  |
Outstanding Performance Bonds | 825.1 myrg_OutstandingPerformanceBonds |  |  |  |
Estimated Cost to Complete Bonded Projects | 125.9 myrg_EstimatedCostToCompleteBondedProjects |  |  |  |
Insurance Claims [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Loss Contingency Insurance Expense | 21.0 myrg_LossContingencyInsuranceExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember | 20.1 myrg_LossContingencyInsuranceExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember | 20.9 myrg_LossContingencyInsuranceExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |
Vehicular Traffic Accident Case [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Reserve for Legal Settlements |  |  |  |  | 2.3 myrg_ReserveForLegalSettlements / us-gaap_LitigationCaseAxis = myrg_VehicularTrafficAccidentCaseMember
Vehicular Traffic Accident Case [Member] | LE Myers Co [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Loss Contingency Compensatory Damages Awarded Value | 0.7 myrg_LossContingencyCompensatoryDamagesAwardedValue / dei_LegalEntityAxis = myrg_LeMyersCoMember / us-gaap_LitigationCaseAxis = myrg_VehicularTrafficAccidentCaseMember |  |  |  |
Loss Contingency Punitive Damages Awarded Value | 3.6 myrg_LossContingencyPunitiveDamagesAwardedValue / dei_LegalEntityAxis = myrg_LeMyersCoMember / us-gaap_LitigationCaseAxis = myrg_VehicularTrafficAccidentCaseMember |  |  |  |
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  | $ 140 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = myrg_LeMyersCoMember / us-gaap_LitigationCaseAxis = myrg_NorthernStatesPowerCompanyWisconsinVsCityOfAshlandWisconsinMember |
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] | Minimum [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Period During Which Defendant Operated Manufactured Gas Plant |  |  |  | 6 years |
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] | Maximum [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Period During Which Defendant Operated Manufactured Gas Plant |  |  |  | 12 years |

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

X
- Definition Represents the insurance expenses, including premiums, for workers' compensation, general liability, automobile liability and employee health benefits. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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, excluding health insurance. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount of the proposed punitive damage awards issued in a legal judgment. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Represents the period during which the defendant operated a manufactured gas plant. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of reserve established for expense relating to settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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