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Contract Assets and Liabilities - Contracts in process (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Costs and estimated earnings on uncompleted contracts	$ 3,710,876	$ 3,532,886
Less: billings to date	3,705,392	3,509,472
Net asset position for contracts in process	$ 5,484	$ 23,414

X

- Definition

Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings.

+ References

No definition available.

+ Details

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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