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Revenue Recognition (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Amount	$ 345,611
Percent	100.00%
Contract Type Fixed price [Member]
Amount	$ 168,590
Percent	48.80%
Contract Type Unit Price [Member]
Amount	$ 55,326
Percent	16.00%
Contract Type T&E [Member]
Amount	$ 89,802
Percent	26.00%
Contract Type Other [Member]
Amount	$ 31,893
Percent	9.20%
T&D [Member]
Amount	$ 216,386
Percent	100.00%
T&D [Member] | Contract Type Fixed price [Member]
Amount	$ 79,435
Percent	36.70%
T&D [Member] | Contract Type Unit Price [Member]
Amount	$ 45,676
Percent	21.10%
T&D [Member] | Contract Type T&E [Member]
Amount	$ 80,345
Percent	37.10%
T&D [Member] | Contract Type Other [Member]
Amount	$ 10,930
Percent	5.10%
C&I [Member]
Amount	$ 129,225
Percent	100.00%
C&I [Member] | Contract Type Fixed price [Member]
Amount	$ 89,155
Percent	69.00%
C&I [Member] | Contract Type Unit Price [Member]
Amount	$ 9,650
Percent	7.50%
C&I [Member] | Contract Type T&E [Member]
Amount	$ 9,457
Percent	7.30%
C&I [Member] | Contract Type Other [Member]
Amount	$ 20,963
Percent	16.20%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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