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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Revenues | $ 2,178,170 | $ 1,713,737
Operating income (loss) | 75,074 | 37,294
Depreciation | 42,693 | 41,170
Electric Power Infrastructure Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,219,502 | 1,187,002
Operating income (loss) | 99,672 | 87,324
Depreciation | 22,086 | 22,945
Oil and Gas Infrastructure Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 958,668 | 526,735
Operating income (loss) | 38,817 | 5,841
Depreciation | 17,364 | 15,801
Corporate and Non-Allocated Costs [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating income (loss) | (63,415) | (55,871)
Depreciation | $ 3,243 | $ 2,424

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