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Lease Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Schedule of Future Minimum Lease Payments for Capital and Operating Leases [Table Text Block] | The future minimum lease payments required under capital leases, together with their present value of capital leases, and operating leases as of December 31, 2017 were as follows:
(In thousands) |  | Capital Lease Obligations |  | Operating Lease Obligations
2018 |  | $ | 1,185 |  |  | $ | 3,599 |
2019 |  |  | 1,185 |  |  |  | 2,885 |
2020 |  |  | 1,185 |  |  |  | 2,187 |
2021 |  |  | 360 |  |  |  | 1,582 |
2022 |  |  | — |  |  |  | 1,014 |
Thereafter |  |  | — |  |  |  | 564 |
Total minimum lease payments |  | $ | 3,915 |  |  | $ | 11,831 |
Interest |  |  | (200 | ) |  |  |  |
Net present of minimum lease payments |  |  | 3,715 |  |  |  |  |
Less: Current portion of capital lease obligations |  |  | 1,086 |  |  |  |  |
Long-term capital lease obligations |  | $ | 2,629 |  |  |  |  |

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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration