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Revenue Recognition - Summary of net asset position for contracts in process (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Unbilled revenue	$ 111,153	$ 78,260
Deferred revenue	(57,051)	(28,919)
Net asset position for contracts in process	$ 54,102	$ 49,341

X

- Definition

Its represent the contract with customer liability revenue.

+ References

No definition available.

+ Details

Name:	myrg_ContractWithCustomerLiabilityRevenue
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

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_UnbilledReceivablesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant