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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