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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Contractors [Line Items]
Deferred revenue	$ 98,597		$ 102,673
Accrued loss provision	2,038		2,813
Contract liabilities	100,635		$ 105,486
Changes in contract liabilities	(4,697)	$ (30,033)
Net Period Change [Member]
Contractors [Line Items]
Changes in deferred revenue	(4,076)
Changes in accrued loss provision	(775)
Changes in contract liabilities	$ (4,851)

X

- Definition

Its represent the contract with customer, liability excluding provision for loss on contracts, current.

+ References

No definition available.

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- Definition

n/a

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X

- Definition

The increase (decrease) during the reporting period of the amount of accrued loss provision.

+ References

No definition available.

+ Details

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Namespace Prefix:	myrg_
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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- Definition

Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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- Definition

Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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