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Contract Assets and Liabilities - Contracts in process (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] |  |
Costs and estimated earnings on uncompleted contracts | $ 7,301,084 | $ 6,716,990
Less: billings to date | 7,335,184 | 6,731,511
Net asset position for contracts in process | $ (34,100) | $ (14,521)

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- Definition Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings. + References No definition available. + Details
Name: | myrg_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarnings
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the billings to date on uncompleted contracts accounted for under the percentage-of-completion method. + References No definition available. + Details
Name: | myrg_BillingsToDate
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the net costs and estimated earnings in excess of billings on uncompleted contracts accounted for under the percentage-of-completion method. + References No definition available. + Details
Name: | myrg_NetCostsAndEstimatedEarningsInExcessOfBillings
Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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