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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,985,281 | $ 2,609,307 | $ 8,059,205 | $ 6,987,851
Operating income (loss) | 192,561 | 140,428 | 390,821 | 325,293
Depreciation | 51,543 | 48,426 | 150,296 | 135,769
Corporate and Non-Allocated Costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (82,687) | (68,134) | (225,219) | (202,552)
Depreciation | 4,559 | 3,693 | 12,609 | 11,302
Electric Power Infrastructure Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,617,736 | 1,504,752 | 4,756,416 | 4,024,983
Operating income (loss) | 179,181 | 150,054 | 466,087 | 362,769
Depreciation | 24,273 | 23,996 | 71,801 | 68,232
Oil and Gas Infrastructure Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,367,545 | 1,104,555 | 3,302,789 | 2,962,868
Operating income (loss) | 96,067 | 58,508 | 149,953 | 165,076
Depreciation | $ 22,711 | $ 20,737 | $ 65,886 | $ 56,235

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