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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Revenues | $ 1,713,737 | $ 1,861,386
Operating income (loss) | 37,294 | 84,150
Depreciation | 41,170 | 39,398
Electric Power Infrastructure Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,187,002 | 1,240,292
Operating income (loss) | 87,324 | 108,992
Depreciation | 22,945 | 20,917
Oil and Gas Infrastructure Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 526,735 | 621,094
Operating income (loss) | 5,841 | 24,147
Depreciation | 15,801 | 16,469
Corporate and Non-Allocated Costs [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating income (loss) | (55,871) | (48,989)
Depreciation | $ 2,424 | $ 2,012

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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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=26872669&loc=d3e20235-122688 + Details
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- Details
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