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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues | $ 2,417,576 | $ 2,178,170
Operating income (loss) | 75,221 | 75,074
Depreciation | 48,719 | 42,693
Electric Power Infrastructure Services |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,568,507 | 1,219,502
Operating income (loss) | 140,895 | 99,672
Depreciation | 24,270 | 22,086
Oil and Gas Infrastructure Services |  |
Segment Reporting Information [Line Items] |  |
Revenues | 849,069 | 958,668
Operating income (loss) | 10,057 | 38,817
Depreciation | 20,695 | 17,364
Corporate and non-allocated costs |  |
Segment Reporting Information [Line Items] |  |
Operating income (loss) | (75,731) | (63,415)
Depreciation | $ 3,754 | $ 3,243

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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