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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Liabilities Current
Payroll and incentive compensation	$ 11,432myrg_AccruedPayrollAndIncentiveCompensationCurrent	$ 10,647myrg_AccruedPayrollAndIncentiveCompensationCurrent
Union dues and benefits	6,721myrg_AccruedUnionDuesAndBenefits	7,122myrg_AccruedUnionDuesAndBenefits
Profit sharing and thrift plan	4,760us-gaap_OtherEmployeeRelatedLiabilitiesCurrent	2,862us-gaap_OtherEmployeeRelatedLiabilitiesCurrent
Taxes, other than income taxes	3,709us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent	4,286us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Legal settlements	302myrg_LegalSettlementLiabilitiesCurrent	2,869myrg_LegalSettlementLiabilitiesCurrent
Other	4,816us-gaap_OtherAccruedLiabilitiesCurrent	4,925us-gaap_OtherAccruedLiabilitiesCurrent
Other current liabilities, total	$ 31,740us-gaap_OtherLiabilitiesCurrent	$ 32,711us-gaap_OtherLiabilitiesCurrent

X

- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided, including obligations incurred and payable for incentive compensation awarded to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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Carrying value as of the balance sheet date of the obligations incurred through that date and payable for union dues and benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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- Definition

Represents the carrying value as of the balance sheet date of potential legal settlement obligations, the payment of which are uncertain. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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-Publisher SEC

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for employer-related costs not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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