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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 583,214 | $ 399,537 | $ 1,500,084 | $ 1,084,824
Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 583,214 | $ 399,537 | $ 1,500,084 | $ 1,084,824
Percent | 100.00% | 100.00% | 100.00% | 100.00%
Fixed-price Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 378,229 | $ 214,497 | $ 879,953 | $ 550,756
Percent | 64.90% | 53.70% | 58.70% | 50.80%
Unit Price Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 68,910 | $ 57,007 | $ 195,109 | $ 169,372
Percent | 11.80% | 14.30% | 13.00% | 15.60%
TE Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 117,167 | $ 85,951 | $ 320,040 | $ 252,768
Percent | 20.10% | 21.50% | 21.30% | 23.30%
Other Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 18,908 | $ 42,082 | $ 104,982 | $ 111,928
Percent | 3.20% | 10.50% | 7.00% | 10.30%
T&D [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 294,940 | $ 222,531 | $ 823,398 | $ 635,842
Percent | 100.00% | 100.00% | 100.00% | 100.00%
T&D [Member] | Fixed-price Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 157,357 | $ 82,058 | $ 410,253 | $ 238,723
Percent | 53.40% | 36.90% | 49.80% | 37.50%
T&D [Member] | Unit Price Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 49,392 | $ 42,751 | $ 152,748 | $ 130,058
Percent | 16.70% | 19.20% | 18.60% | 20.50%
T&D [Member] | TE Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 84,299 | $ 76,520 | $ 237,448 | $ 224,938
Percent | 28.60% | 34.40% | 28.80% | 35.40%
T&D [Member] | Other Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 3,892 | $ 21,202 | $ 22,949 | $ 42,123
Percent | 1.30% | 9.50% | 2.80% | 6.60%
C&I [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 288,274 | $ 177,006 | $ 676,686 | $ 448,982
Percent | 100.00% | 100.00% | 100.00% | 100.00%
C&I [Member] | Fixed-price Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 220,872 | $ 132,439 | $ 469,700 | $ 312,033
Percent | 76.60% | 74.80% | 69.40% | 69.50%
C&I [Member] | Unit Price Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 19,518 | $ 14,256 | $ 42,361 | $ 39,314
Percent | 6.80% | 8.10% | 6.30% | 8.80%
C&I [Member] | TE Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 32,868 | $ 9,431 | $ 82,592 | $ 27,830
Percent | 11.40% | 5.30% | 12.20% | 6.20%
C&I [Member] | Other Contract [Member] | Revenue from Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount | $ 15,016 | $ 20,880 | $ 82,033 | $ 69,805
Percent | 5.20% | 11.80% | 12.10% | 15.50%

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