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Contract Assets and Liabilities - Contracts in process (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Contract Assets and Liabilities
Costs and estimated earnings on uncompleted contracts	$ 3,335,968	$ 2,718,713
Less: Billings to date	3,261,124	2,664,611
Net asset position for contracts in process	$ 74,844	$ 54,102

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_ContractorsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration