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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Internal financial reports
Contract revenues	$ 250,558	$ 210,489	$ 751,196	$ 546,093
Operating income (loss)	14,236	6,634	40,121	20,244
T&D
Internal financial reports
Contract revenues	204,264	170,849	625,078	428,536
Operating income (loss)	20,174	11,273	57,897	36,648
C&I
Internal financial reports
Contract revenues	46,294	39,640	126,118	117,557
Operating income (loss)	2,367	1,603	5,326	3,279
General Corporate
Internal financial reports
Operating income (loss)	$ (8,305)	$ (6,242)	$ (23,102)	$ (19,683)

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- Definition

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+ References

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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=6880815&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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