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Lease Obligations (Tables) | 9 Months Ended
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Sep. 30, 2018
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 and operating leases, together with the present value of capital leases, as of September 30, 2018 were as follows
|  | Capital |  |  | Operating |
(In thousands) |  | Lease Obligations |  |  | Lease Obligations |
Remainder of 2018 |  | $ | 296 |  |  | $ | 1,236 |
2019 |  |  | 1,185 |  |  |  | 4,081 |
2020 |  |  | 1,185 |  |  |  | 2,988 |
2021 |  |  | 363 |  |  |  | 2,270 |
2022 |  |  | — |  |  |  | 1,692 |
Thereafter |  |  | — |  |  |  | 771 |
Total minimum lease payments |  | $ | 3,029 |  |  | $ | 13,038 |
Interest |  |  | (123 | ) |  |  |  |
Net present value of minimum lease payments |  |  | 2,906 |  |  |  |  |
Less: Current portion of capital lease obligations |  |  | 1,110 |  |  |  |  |
Long-term capital lease obligations |  | $ | 1,796 |  |  |  |  |

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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
Name: | myrg_ScheduleOfFutureMinimumLeasePaymentsForCapitalAndOperatingLeasesTableTextBlock
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