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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Internal financial reports
Contract revenues	$ 260,410	$ 185,310	$ 500,638	$ 335,604
Operating income (loss)	15,657	5,987	25,885	13,610
T&D
Internal financial reports
Contract revenues	215,816	139,662	420,814	257,687
Operating income (loss)	20,911	11,832	37,723	25,375
C&I
Internal financial reports
Contract revenues	44,594	45,648	79,824	77,917
Operating income (loss)	1,860	824	2,959	1,676
General Corporate
Internal financial reports
Operating income (loss)	$ (7,114)	$ (6,669)	$ (14,797)	$ (13,441)

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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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