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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,609,307 | $ 2,042,186 | $ 6,987,851 | $ 5,548,353
Operating income (loss) | 140,428 | 130,163 | 325,293 | 202,926
Depreciation | 48,426 | 42,678 | 135,769 | 126,607
Electric Power Infrastructure Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,504,752 | 1,222,432 | 4,024,983 | 3,568,521
Operating income (loss) | 150,054 | 118,998 | 362,769 | 282,256
Depreciation | 23,996 | 22,906 | 68,232 | 68,788
Oil and Gas Infrastructure Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,104,555 | 819,754 | 2,962,868 | 1,979,832
Operating income (loss) | 58,508 | 65,661 | 165,076 | 83,401
Depreciation | 20,737 | 17,296 | 56,235 | 50,351
Corporate and non-allocated costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (68,134) | (54,496) | (202,552) | (162,731)
Depreciation | $ 3,693 | $ 2,476 | $ 11,302 | $ 7,468

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