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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 799,848 | $ 610,182 | $ 2,144,586 | $ 1,852,241
Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 100.00% | 100.00% | 100.00% | 100.00%
Fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 506,160 | $ 368,988 | $ 1,312,257 | $ 1,165,359
Fixed price | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 63.30% | 60.50% | 61.20% | 62.90%
Unit price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 154,718 | $ 104,767 | $ 409,383 | $ 316,966
Unit price | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 19.30% | 17.20% | 19.10% | 17.10%
T&E |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 138,970 | $ 136,427 | $ 422,946 | $ 369,916
T&E | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 17.40% | 22.30% | 19.70% | 20.00%
T&D |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 452,014 | $ 306,546 | $ 1,232,105 | $ 948,285
T&D | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 100.00% | 100.00% | 100.00% | 100.00%
T&D | Fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 216,082 | $ 122,185 | $ 559,920 | $ 431,673
T&D | Fixed price | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 47.80% | 39.90% | 45.50% | 45.50%
T&D | Unit price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 127,121 | $ 83,200 | $ 349,051 | $ 258,489
T&D | Unit price | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 28.10% | 27.10% | 28.30% | 27.30%
T&D | T&E |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 108,811 | $ 101,161 | $ 323,134 | $ 258,123
T&D | T&E | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 24.10% | 33.00% | 26.20% | 27.20%
C&I |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 347,834 | $ 303,636 | $ 912,481 | $ 903,956
C&I | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 100.00% | 100.00% | 100.00% | 100.00%
C&I | Fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 290,078 | $ 246,803 | $ 752,337 | $ 733,686
C&I | Fixed price | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 83.40% | 81.30% | 82.50% | 81.20%
C&I | Unit price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 27,597 | $ 21,567 | $ 60,332 | $ 58,477
C&I | Unit price | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 7.90% | 7.10% | 6.60% | 6.50%
C&I | T&E |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract revenues | $ 30,159 | $ 35,266 | $ 99,812 | $ 111,793
C&I | T&E | Product concentration risk | Revenue benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk, Percent | 8.70% | 11.60% | 10.90% | 12.30%

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