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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,839,199 | $ 2,656,348 | $ 5,646,458 | $ 5,073,924
Operating income (loss) | 78,580 | 123,039 | 198,067 | 198,260
Depreciation | 53,811 | 50,034 | 106,027 | 98,753
Corporate and Non-Allocated Costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (84,298) | (66,801) | (167,127) | (142,532)
Depreciation | 4,363 | 4,296 | 8,773 | 8,050
Electric Power Infrastructure Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,734,336 | 1,570,173 | 3,398,359 | 3,138,680
Operating income (loss) | 92,935 | 146,011 | 254,552 | 286,906
Depreciation | 26,714 | 23,258 | 51,965 | 47,528
Pipeline and Industrial Infrastructure Services Division | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,104,863 | 1,086,175 | 2,248,099 | 1,935,244
Operating income (loss) | 69,943 | 43,829 | 110,642 | 53,886
Depreciation | $ 22,734 | $ 22,480 | $ 45,289 | $ 43,175

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