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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Amount	$ 399,537	$ 1,084,824
Percent	100.00%	100.00%
Contract Type Fixed price [Member]
Amount	$ 214,497	$ 550,756
Percent	53.70%	50.80%
Contract Type Unit Price [Member]
Amount	$ 57,007	$ 169,372
Percent	14.30%	15.60%
Contract Type T&E [Member]
Amount	$ 85,951	$ 252,768
Percent	21.50%	23.30%
Contract Type Other [Member]
Amount	$ 42,082	$ 111,928
Percent	10.50%	10.30%
T&D [Member]
Amount	$ 222,531	$ 635,842
Percent	100.00%	100.00%
T&D [Member] | Contract Type Fixed price [Member]
Amount	$ 82,058	$ 238,723
Percent	36.90%	37.50%
T&D [Member] | Contract Type Unit Price [Member]
Amount	$ 42,751	$ 130,058
Percent	19.20%	20.50%
T&D [Member] | Contract Type T&E [Member]
Amount	$ 76,520	$ 224,938
Percent	34.40%	35.40%
T&D [Member] | Contract Type Other [Member]
Amount	$ 21,202	$ 42,123
Percent	9.50%	6.60%
C&I [Member]
Amount	$ 177,006	$ 448,982
Percent	100.00%	100.00%
C&I [Member] | Contract Type Fixed price [Member]
Amount	$ 132,439	$ 312,033
Percent	74.80%	69.50%
C&I [Member] | Contract Type Unit Price [Member]
Amount	$ 14,256	$ 39,314
Percent	8.10%	8.80%
C&I [Member] | Contract Type T&E [Member]
Amount	$ 9,431	$ 27,830
Percent	5.30%	6.20%
C&I [Member] | Contract Type Other [Member]
Amount	$ 20,880	$ 69,805
Percent	11.80%	15.50%

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- 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.

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