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v3.20.1

Revenue Recognition - Additional information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items] |
Remaining performance obligations | $ 1,430
Minimum [Member] |
Disaggregation of Revenue [Line Items] |
Term of master service agreements | 1 year
Short termination notice of master service agreements | 30 days
Maximum [Member] |
Disaggregation of Revenue [Line Items] |
Term of master service agreements | 3 years
Short termination notice of master service agreements | 90 days

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- Definition Term of master service agreements ("MSAs"), in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Short termination notice of master service agreements ("MSAs"), in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact + References No definition available. + Details
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Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |