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Contract Assets and Liabilities - Summary of net asset position for 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] |  |
Unbilled revenue | $ 216,515 | $ 217,083
Deferred revenue | (250,615) | (231,604)
Net asset position for contracts in process | $ (34,100) | $ (14,521)

X
- Definition Its represent the contract with customer, liability excluding provision for loss on contracts, current. + References No definition available. + Details
Name: | myrg_ContractWithCustomerLiabilityExcludingProvisionForLossOnContractsCurrent
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

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

X
- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 912 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478345/912-310-45-2 + Details
Name: | us-gaap_UnbilledContractsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant