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Contract Assets and Liabilities - Summary of net asset position for contracts in process (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Unbilled revenue	$ 129,850	$ 111,153
Deferred revenue	(27,065)	(57,051)
Net asset position for contracts in process	$ 102,785	$ 54,102

X

- Definition

Its represent the contract with customer, liability excluding provision for loss on contracts, current.

+ References

No definition available.

+ Details

Name:	myrg_ContractWithCustomerLiabilityExcludingProvisionForLossOnContractsCurrent
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