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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Segment Information
Number of reporting segments									2
Segment contract revenues and operating income (loss)
Contract revenues	$ 254,581	$ 232,890	$ 213,916	$ 201,342	$ 247,763	$ 250,558	$ 260,410	$ 240,228	$ 902,729	$ 998,959	$ 780,356
Income from operations									55,617	55,762	29,629
General Corporate
Segment contract revenues and operating income (loss)
Income from operations									(36,219)	(32,345)	(28,257)
T&D
Segment contract revenues and operating income (loss)
Contract revenues									722,387	828,711	622,000
T&D | Operating segment
Segment contract revenues and operating income (loss)
Income from operations									81,413	80,460	52,053
C&I
Segment contract revenues and operating income (loss)
Contract revenues									180,342	170,248	158,356
C&I | Operating segment
Segment contract revenues and operating income (loss)
Income from operations									$ 10,423	$ 7,647	$ 5,833

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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

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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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