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Commitments and Contingencies (Details)	9 Months Ended
	Sep. 30, 2025 USD ($)
Other Commitments [Line Items]
Purchase orders outstanding	$ 7,300,000
Performance Guarantee
Other Commitments [Line Items]
Bonds outstanding	2,260,000,000
Estimated remaining costs for bonded projects	702,200,000
Contingencies Excluding Wildfire and Health Insurance
Other Commitments [Line Items]
Insurance coverage deductible	1,000,000.0
Health Insurance
Other Commitments [Line Items]
Insurance coverage deductible	$ 200,000

X

- Definition

Its represents the guarantor obligations expected costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
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Balance Type:	debit
Period Type:	duration

X

- Definition

amount of Deductible Insurance Policy for Loss Contingency

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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Namespace Prefix:	us-gaap_
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X

- 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

X

- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Details

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- Details

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- Details

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