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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment [Line Items]
Contract revenues:	$ 248,473	$ 232,890	$ 692,988	$ 648,148
Operating income (loss):	13,407	13,079	35,934	39,831
T&D [Member]
Segment [Line Items]
Contract revenues:	179,960	187,156	508,385	521,729
Operating income (loss):	16,892	22,757	47,636	61,197
C&I [Member]
Segment [Line Items]
Contract revenues:	68,513	45,734	184,603	126,419
Operating income (loss):	5,427	2,387	13,149	6,542
General Corporate [Member]
Segment [Line Items]
Operating income (loss):	$ (8,912)	$ (12,065)	$ (24,851)	$ (27,908)

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- Definition

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

+ References

No definition available.

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- 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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