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Lease Obligations - Additional information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
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	$ 53,730		$ 53,730
Subsidiaries | Employees
Operating And Finance Leases [Line Items]
Operating lease expense	600	$ 600	1,300	$ 1,300
Minimum lease payments required	$ 8,700		$ 8,700
Lease amortization period			4 years 2 months 12 days
Minimum
Operating And Finance Leases [Line Items]
Remaining lease term			1 year
Maximum
Operating And Finance Leases [Line Items]
Remaining lease term			8 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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X

- Definition

Lessee operating and finance leases remaining contract term.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
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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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X

- Definition

n/a

+ References

No definition available.

+ Details

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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/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 4: 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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- Details

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X

- Details

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