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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Contractors [Line Items]
Deferred revenue	$ 75,641		$ 57,051
Accrued loss provision	1,652		1,483
Contract liabilities	77,293		$ 58,534
Changes in contract liabilities	(397)	$ 8,681
Net Period Change [Member]
Contractors [Line Items]
Changes in deferred revenue	18,590
Changes in accrued loss provision	169
Changes in contract liabilities	$ 18,759

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- Definition

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

+ References

No definition available.

+ Details

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X

- 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
-Section 45
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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
-Name Accounting Standards Codification
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-Section 45
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-Subparagraph (a)
-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.

+ References

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