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Commitments and Contingencies (Details Textual 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Loss Contingencies [Abstract]
Letters of Credit Outstanding, Amount	$ 19.3us-gaap_LettersOfCreditOutstandingAmount	$ 19.3us-gaap_LettersOfCreditOutstandingAmount
Letters Of Credit Outstanding Amount Related To Payment Obligation Under Insurance Programs	17.5myrg_LettersOfCreditOutstandingAmountRelatedToPaymentObligationUnderInsurancePrograms	17.5myrg_LettersOfCreditOutstandingAmountRelatedToPaymentObligationUnderInsurancePrograms
Letters Of Credit Outstanding Amount Related To Contract Performance Obligations	1.8myrg_LettersOfCreditOutstandingAmountRelatedToContractPerformanceObligations	1.8myrg_LettersOfCreditOutstandingAmountRelatedToContractPerformanceObligations
Future minimum lease payments for operating leases
2015	1.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016	0.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017	0.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018	0.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019	0.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Purchase Commitments for Construction Equipment
Significant Purchase Commitment Scheduled Period of Time for Cash Outlay	3 months
Outstanding purchase orders for certain construction equipment	$ 9.7us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Maximum [Member]
Operating Leases [Abstract]
Operating Lease Term	5 years
Minimum [Member]
Operating Leases [Abstract]
Operating Lease Term	1 year

X

- Definition

Represents the amount of the letters of credit related to contract performance obligations.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

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- Definition

Represents the schedule period of time for cash outlay requirements under an existing purchase commitment.

+ References

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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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

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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.

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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 fourth 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

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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 third 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.

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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 second 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.

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- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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