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Contracts in Process (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Contracts in Process [Line Items] |  |
Costs and estimated earnings on uncompleted contracts | $ 2,153,085 | $ 1,746,507
Less: Billings to date | 2,142,213 | 1,740,019
Net asset position for contracts in process | $ 10,872 | $ 6,488

X
- Definition Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings. + References No definition available. + Details
Name: | myrg_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarnings
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