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Revenue Recognition - Schedule of revenue by contract type (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Amount	$ 1,531,169
Percent	100.00%
Contract Type Fixed price [Member]
Amount	$ 814,431
Percent	53.20%
Contract Type Unit Price [Member]
Amount	$ 232,769
Percent	15.20%
Contract Type T&E [Member]
Amount	$ 340,519
Percent	22.20%
Contract Type Other [Member]
Amount	$ 143,450
Percent	9.40%
T&D [Member]
Amount	$ 893,108
Percent	100.00%
T&D [Member] | Contract Type Fixed price [Member]
Amount	$ 361,699
Percent	40.50%
T&D [Member] | Contract Type Unit Price [Member]
Amount	$ 181,179
Percent	20.30%
T&D [Member] | Contract Type T&E [Member]
Amount	$ 305,581
Percent	34.20%
T&D [Member] | Contract Type Other [Member]
Amount	$ 44,649
Percent	5.00%
C&I [Member]
Amount	$ 638,061
Percent	100.00%
C&I [Member] | Contract Type Fixed price [Member]
Amount	$ 452,732
Percent	71.00%
C&I [Member] | Contract Type Unit Price [Member]
Amount	$ 51,590
Percent	8.10%
C&I [Member] | Contract Type T&E [Member]
Amount	$ 34,938
Percent	5.40%
C&I [Member] | Contract Type Other [Member]
Amount	$ 98,801
Percent	15.50%

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.

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- 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).

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