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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Amount	$ 448,776	$ 339,676	$ 916,870	$ 685,287
Sales Revenue, Net [Member]
Amount	$ 448,776	$ 339,676	$ 916,870	$ 685,287
Percent	100.00%	100.00%	100.00%	100.00%
Contract Type Fixed price [Member] | Sales Revenue, Net [Member]
Amount	$ 234,689	$ 167,669	$ 501,724	$ 336,259
Percent	52.30%	49.40%	54.70%	49.10%
Contract Type Unit price [Member] | Sales Revenue, Net [Member]
Amount	$ 65,017	$ 57,039	$ 126,199	$ 112,365
Percent	14.50%	16.80%	13.80%	16.40%
Contract Type T&E [Member] | Sales Revenue, Net [Member]
Amount	$ 114,034	$ 77,015	$ 202,873	$ 166,817
Percent	25.40%	22.70%	22.10%	24.30%
Contract Type Other [Member] | Sales Revenue, Net [Member]
Amount	$ 35,036	$ 37,953	$ 86,074	$ 69,846
Percent	7.80%	11.10%	9.40%	10.20%
T&D [Member] | Sales Revenue, Net [Member]
Amount	$ 255,910	$ 196,925	$ 528,458	$ 413,311
Percent	100.00%	100.00%	100.00%	100.00%
T&D [Member] | Contract Type Fixed price [Member] | Sales Revenue, Net [Member]
Amount	$ 119,572	$ 77,230	$ 252,896	$ 156,665
Percent	46.70%	39.20%	47.90%	37.90%
T&D [Member] | Contract Type Unit price [Member] | Sales Revenue, Net [Member]
Amount	$ 52,162	$ 41,631	$ 103,356	$ 87,307
Percent	20.40%	21.10%	19.60%	21.10%
T&D [Member] | Contract Type T&E [Member] | Sales Revenue, Net [Member]
Amount	$ 76,841	$ 68,073	$ 153,149	$ 148,418
Percent	30.00%	34.60%	29.00%	35.90%
T&D [Member] | Contract Type Other [Member] | Sales Revenue, Net [Member]
Amount	$ 7,335	$ 9,991	$ 19,057	$ 20,921
Percent	2.90%	5.10%	3.50%	5.10%
C&I [Member] | Sales Revenue, Net [Member]
Amount	$ 192,866	$ 142,751	$ 388,412	$ 271,976
Percent	100.00%	100.00%	100.00%	100.00%
C&I [Member] | Contract Type Fixed price [Member] | Sales Revenue, Net [Member]
Amount	$ 115,117	$ 90,439	$ 248,828	$ 179,594
Percent	59.70%	63.40%	64.10%	66.00%
C&I [Member] | Contract Type Unit price [Member] | Sales Revenue, Net [Member]
Amount	$ 12,855	$ 15,408	$ 22,843	$ 25,058
Percent	6.70%	10.80%	5.90%	9.20%
C&I [Member] | Contract Type T&E [Member] | Sales Revenue, Net [Member]
Amount	$ 37,193	$ 8,942	$ 49,724	$ 18,399
Percent	19.30%	6.30%	12.80%	6.80%
C&I [Member] | Contract Type Other [Member] | Sales Revenue, Net [Member]
Amount	$ 27,701	$ 27,962	$ 67,017	$ 48,925
Percent	14.30%	19.50%	17.20%	18.00%

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