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Contract Assets and Liabilities - Contracts in Process (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Contractors [Abstract] |  |
Costs and estimated earnings on uncompleted contracts | $ 3,921,376 | $ 3,532,886
Less: billings to date | 3,979,403 | 3,509,472
Net asset position for contracts in process | $ (58,027) | $ 23,414

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- Definition Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings. + References No definition available. + Details
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- Definition Represents the billings to date on uncompleted contracts accounted for under the percentage-of-completion method. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- 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
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Namespace Prefix: | myrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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