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Commitments and Contingencies (Details Textual 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Loss Contingencies [Abstract] |  |  |
Letters of Credit Outstanding, Amount | $ 19.3 us-gaap_LettersOfCreditOutstandingAmount | $ 18.4 us-gaap_LettersOfCreditOutstandingAmount |
Letters Of Credit Outstanding Amount Related To Payment Obligation Under Insurance Programs | 17.5 myrg_LettersOfCreditOutstandingAmountRelatedToPaymentObligationUnderInsurancePrograms | 17.5 myrg_LettersOfCreditOutstandingAmountRelatedToPaymentObligationUnderInsurancePrograms |
Letters Of Credit Outstanding Amount Related To Contract Performance Obligations | 1.8 myrg_LettersOfCreditOutstandingAmountRelatedToContractPerformanceObligations | 0.9 myrg_LettersOfCreditOutstandingAmountRelatedToContractPerformanceObligations |
Future minimum lease payments for operating leases |  |  |
2015 | 1.4 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
2016 | 0.7 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
2017 | 0.4 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
2018 | 0.3 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
2019 | 0.3 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
Operating lease, additional disclosure |  |  |
Rent expense | 41.1 us-gaap_LeaseAndRentalExpense | 51.2 us-gaap_LeaseAndRentalExpense | 43.1 us-gaap_LeaseAndRentalExpense
Purchase Commitments for Construction Equipment |  |  |
Significant Purchase Commitment Scheduled Period of Time for Cash Outlay | 5 months |  |
Outstanding purchase orders for certain construction equipment | $ 7.0 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted |  |
Maximum [Member] |  |  |
Operating Leases [Abstract] |  |  |
Operating Lease Term | 6 years |  |
Minimum [Member] |  |  |
Operating Leases [Abstract] |  |  |
Operating Lease Term | 1 year |  |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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