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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,200,374 | $ 1,792,430 | $ 4,378,544 | $ 3,506,167
Operating income (loss) | 109,791 | 35,469 | 184,865 | 72,763
Depreciation | 44,650 | 42,759 | 87,343 | 83,929
Electric Power Infrastructure Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,300,729 | 1,159,087 | 2,520,231 | 2,346,089
Operating income (loss) | 113,043 | 75,934 | 212,715 | 163,258
Depreciation | 22,150 | 22,937 | 44,236 | 45,882
Oil and Gas Infrastructure Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 899,645 | 633,343 | 1,858,313 | 1,160,078
Operating income (loss) | 67,751 | 11,899 | 106,568 | 17,740
Depreciation | 18,134 | 17,254 | 35,498 | 33,055
Corporate and non-allocated costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (71,003) | (52,364) | (134,418) | (108,235)
Depreciation | $ 4,366 | $ 2,568 | $ 7,609 | $ 4,992

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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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