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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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