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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Amount	$ 468,094	$ 345,611
Sales Revenue, Net [Member]
Amount	$ 468,094	$ 345,611
Percent	100.00%	100.00%
Contract Type Fixed price [Member] | Sales Revenue, Net [Member]
Amount	$ 267,035	$ 168,590
Percent	57.00%	48.80%
Contract Type Unit price [Member] | Sales Revenue, Net [Member]
Amount	$ 61,182	$ 55,326
Percent	13.10%	16.00%
Contract Type T&E [Member] | Sales Revenue, Net [Member]
Amount	$ 88,839	$ 89,802
Percent	19.00%	26.00%
Contract Type Other [Member] | Sales Revenue, Net [Member]
Amount	$ 51,038	$ 31,893
Percent	10.90%	9.20%
T&D [Member] | Sales Revenue, Net [Member]
Amount	$ 272,548	$ 216,386
Percent	100.00%	100.00%
T&D [Member] | Contract Type Fixed price [Member] | Sales Revenue, Net [Member]
Amount	$ 133,324	$ 79,435
Percent	48.90%	36.70%
T&D [Member] | Contract Type Unit price [Member] | Sales Revenue, Net [Member]
Amount	$ 51,194	$ 45,676
Percent	18.80%	21.10%
T&D [Member] | Contract Type T&E [Member] | Sales Revenue, Net [Member]
Amount	$ 76,308	$ 80,345
Percent	28.00%	37.10%
T&D [Member] | Contract Type Other [Member] | Sales Revenue, Net [Member]
Amount	$ 11,722	$ 10,930
Percent	4.30%	5.10%
C&I [Member] | Sales Revenue, Net [Member]
Amount	$ 195,546	$ 129,225
Percent	100.00%	100.00%
C&I [Member] | Contract Type Fixed price [Member] | Sales Revenue, Net [Member]
Amount	$ 133,711	$ 89,155
Percent	68.40%	69.00%
C&I [Member] | Contract Type Unit price [Member] | Sales Revenue, Net [Member]
Amount	$ 9,988	$ 9,650
Percent	5.10%	7.50%
C&I [Member] | Contract Type T&E [Member] | Sales Revenue, Net [Member]
Amount	$ 12,531	$ 9,457
Percent	6.40%	7.30%
C&I [Member] | Contract Type Other [Member] | Sales Revenue, Net [Member]
Amount	$ 39,316	$ 20,963
Percent	20.10%	16.20%

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