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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 1,792,430 | $ 1,872,340 | $ 3,506,167 | $ 3,733,726
Operating income (loss) | 35,469 | 68,851 | 72,763 | 153,001
Depreciation | 42,759 | 41,030 | 83,929 | 80,428
Electric Power Infrastructure Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,159,087 | 1,222,324 | 2,346,089 | 2,462,616
Operating income (loss) | 75,934 | 88,027 | 163,258 | 197,019
Depreciation | 22,937 | 22,072 | 45,882 | 42,989
Oil and Gas Infrastructure Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 633,343 | 650,016 | 1,160,078 | 1,271,110
Operating income (loss) | 11,899 | 35,981 | 17,740 | 60,128
Depreciation | 17,254 | 16,783 | 33,055 | 33,252
Corporate and Non-Allocated Costs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (52,364) | (55,157) | (108,235) | (104,146)
Depreciation | $ 2,568 | $ 2,175 | $ 4,992 | $ 4,187

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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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