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Lease Obligations - Additional information (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 USD ($)
Operating And Finance Leases [Line Items] |
Option to extend lease term (up to) | 5 years
Option to terminate leases, period | 1 year
Minimum lease payments required | $ 29,068
Subsidiaries [Member] | Employees [Member] |
Operating And Finance Leases [Line Items] |
Minimum lease payments required | $ 3,900
Lease amortization period | 4 years
Minimum [Member] |
Operating And Finance Leases [Line Items] |
Remaining lease term | 1 year
Maximum [Member] |
Operating And Finance Leases [Line Items] |
Remaining lease term | 6 years

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- Definition Lessee, operating and finance leases, option to extend, term. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, operating and finance leases, option to terminate, period. + References No definition available. + Details
Name: | myrg_LesseeOperatingAndFinanceLeasesOptionToTerminatePeriod
Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee operating and finance leases remaining contract term. + References No definition available. + Details
Name: | myrg_LesseeOperatingAndFinanceLeasesRemainingContractTerm
Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents Lessee Operating Lease Amortization Period. + References No definition available. + Details
Name: | myrg_LesseeOperatingLeaseAmortizationPeriod
Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition n/a + References No definition available. + Details
Name: | myrg_OperatingAndFinanceLeasesLineItems
Namespace Prefix: | myrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_TitleOfIndividualAxis=myrg_EmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |