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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,042,186 | $ 1,939,438 | $ 5,548,353 | $ 5,673,164
Operating income (loss) | 130,163 | 80,878 | 202,926 | 233,879
Depreciation | 42,678 | 40,954 | 126,607 | 121,382
Electric Power Infrastructure Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,222,432 | 1,183,151 | 3,568,521 | 3,645,767
Operating income (loss) | 118,998 | 76,948 | 282,256 | 273,967
Depreciation | 22,906 | 22,801 | 68,788 | 65,790
Oil and Gas Infrastructure Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 819,754 | 756,287 | 1,979,832 | 2,027,397
Operating income (loss) | 65,661 | 58,874 | 83,401 | 119,002
Depreciation | 17,296 | 16,347 | 50,351 | 49,599
Corporate and Non-Allocated Costs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (54,496) | (54,944) | (162,731) | (159,090)
Depreciation | $ 2,476 | $ 1,806 | $ 7,468 | $ 5,993

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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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