XML 98 R83.htm IDEA: XBRL DOCUMENT
v3.20.4

Stock-Based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - Stock Options | 12 Months Ended
--- | ---
Dec. 31, 2020 $ / shares shares
Options Outstanding and Exercisable |
Number Of Options (in shares) | shares | 24,557
Weighted-Average Exercise Price (in dollars per share) | $ 22.94
Weighted- Average Remaining Contractual Term | 1 year 10 months 24 days
Range Of Exercise Prices From Dollars 17.48 To 17.48 |
Stock options outstanding |
Exercise price, low end of range | $ 17.48
Exercise price, high end of range | $ 17.48
Options Outstanding and Exercisable |
Number Of Options (in shares) | shares | 5,817
Weighted-Average Exercise Price (in dollars per share) | $ 17.48
Weighted- Average Remaining Contractual Term | 1 year 2 months 12 days
Range Of Exercise Prices From Dollars 24.18 To 24.18 |
Stock options outstanding |
Exercise price, low end of range | $ 24.18
Exercise price, high end of range | $ 24.18
Options Outstanding and Exercisable |
Number Of Options (in shares) | shares | 1,577
Weighted-Average Exercise Price (in dollars per share) | $ 24.18
Weighted- Average Remaining Contractual Term | 2 months 12 days
Range Of Exercise Prices From Dollars 24.68 To 24.68 |
Stock options outstanding |
Exercise price, low end of range | $ 24.68
Exercise price, high end of range | $ 24.68
Options Outstanding and Exercisable |
Number Of Options (in shares) | shares | 17,163
Weighted-Average Exercise Price (in dollars per share) | $ 24.68
Weighted- Average Remaining Contractual Term | 2 years 2 months 12 days

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

X
- Definition The number of shares reserved for issuance pertaining to the outstanding and exercisable stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References No definition available. + Details
Name: | myrg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptions
Namespace Prefix: | myrg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding and exercisable stock options which are in the customized range of exercise prices. + References No definition available. + Details
Name: | myrg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingAndExercisableOptionsWeightedAverageExercisePrice
Namespace Prefix: | myrg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term of outstanding and Exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | myrg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAndExercisableWeightedAverageRemainingContractualTerm2
Namespace Prefix: | myrg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=myrg_RangeOfExercisePricesFromDollarsSeventeenPointFortyEightToSeventeenPointFortyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=myrg_RangeOfExercisePricesFromDollarsTwentyFourPointEighteenToTwentyFourPointEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=myrg_RangeOfExercisePricesFromDollarsTwentyFourPointSixtyEightToTwentyFourPointSixtyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |