XML 19 R30.htm IDEA: XBRL DOCUMENT v2.4.1.9

Subsequent Event (Details Textual) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Apr. 13, 2015	Mar. 31, 2015
Subsequent Event [Line Items]
Purchase Price of Acquisition, in Cash	$ 11.4us-gaap_PaymentsToAcquireBusinessesGross
E.S. Boulos Company [Member]
Subsequent Event [Line Items]
Minimum Experiance In Operation		95 years

X

- Definition

The minimum number of years of experiance in operation.

+ References

No definition available.

+ Details

Name:	myrg_MinimumExperianceInOperation
Namespace Prefix:	myrg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration