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Contracts in Process (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Contracts in Process [Line Items] |  |
Costs and estimated earnings on uncompleted contracts | $ 2,105,022 | $ 1,978,981
Less: Billings to date | 2,066,073 | 1,929,640
Net asset position for contracts in process | $ 38,949 | $ 49,341

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
- References No definition available. + Details
Name: | myrg_ContractsInProcessLineItems
Namespace Prefix: | myrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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