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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Contract revenues:	$ 250,979us-gaap_SalesRevenueServicesNet	$ 248,473us-gaap_SalesRevenueServicesNet	$ 228,877us-gaap_SalesRevenueServicesNet	$ 215,638us-gaap_SalesRevenueServicesNet	$ 254,581us-gaap_SalesRevenueServicesNet	$ 232,890us-gaap_SalesRevenueServicesNet	$ 213,916us-gaap_SalesRevenueServicesNet	$ 201,342us-gaap_SalesRevenueServicesNet	$ 943,967us-gaap_SalesRevenueServicesNet	$ 902,729us-gaap_SalesRevenueServicesNet	$ 998,959us-gaap_SalesRevenueServicesNet
Income from operations									58,404us-gaap_OperatingIncomeLoss	55,617us-gaap_OperatingIncomeLoss	55,762us-gaap_OperatingIncomeLoss
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues:									699,595us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember	722,387us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember	828,711us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember
Income from operations									75,439us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember	81,413us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember	80,460us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = myrg_TdMember
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues:									244,372us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember	180,342us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember	170,248us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember
Income from operations									16,542us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember	10,423us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember	7,647us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = myrg_CiMember
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations									$ (33,577)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ (36,219)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ (32,345)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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X

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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