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Contract Assets and Liabilities - Contracts in Process (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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.

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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.

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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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