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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,352,895 | $ 2,985,281 | $ 8,999,353 | $ 8,059,205
Operating income (loss) | 209,394 | 192,561 | 407,461 | 390,821
Depreciation | 55,562 | 51,543 | 161,589 | 150,296
Corporate and Non-Allocated Costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (98,722) | (82,687) | (265,849) | (225,219)
Depreciation | 5,445 | 4,559 | 14,218 | 12,609
Electric Power Infrastructure Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,876,097 | 1,617,736 | 5,274,456 | 4,756,416
Operating income (loss) | 175,692 | 179,181 | 430,244 | 466,087
Depreciation | 27,240 | 24,273 | 79,205 | 71,801
Pipeline and Industrial Infrastructure Services Division | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,476,798 | 1,367,545 | 3,724,897 | 3,302,789
Operating income (loss) | 132,424 | 96,067 | 243,066 | 149,953
Depreciation | $ 22,877 | $ 22,711 | $ 68,166 | $ 65,886

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