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Lease Obligations - Additional information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating And Finance Leases [Line Items]
Option to extend lease term (up to)			10 years
Option to terminate leases, period			1 year
Minimum lease payments required	$ 47,616		$ 47,616
Subsidiaries | Employees
Operating And Finance Leases [Line Items]
Operating lease expense	600	$ 600	1,900	$ 1,800
Minimum lease payments required	$ 10,900		$ 10,900
Lease amortization period			4 years 10 months 24 days
Minimum
Operating And Finance Leases [Line Items]
Remaining lease term			1 year
Maximum
Operating And Finance Leases [Line Items]
Remaining lease term			9 years

X

- Definition

Lessee, operating and finance leases, option to extend, term.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Lessee, operating and finance leases, option to terminate, period.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
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X

- Definition

Lessee operating and finance leases remaining contract term.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

It represents Lessee Operating Lease Amortization Period.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
Data Type:	xbrli:durationItemType
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X

- Definition

n/a

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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Period Type:

X

- Details

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- Details

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