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v3.8.0.1

Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,478,627 | $ 2,609,307 | $ 2,200,374 | $ 2,178,170 | $ 2,102,966 | $ 2,042,186 | $ 1,792,430 | $ 1,713,737 | $ 9,466,478 | $ 7,651,319 | $ 7,572,436
Operating income (loss) |  |  |  |  |  |  |  |  | 378,849 | 320,813 | 237,503
Depreciation |  |  |  |  |  |  |  |  | 183,808 | 170,240 | 162,845
Operating Segments | Electric Power Infrastructure Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,599,836 | 4,850,495 | 4,937,289
Operating income (loss) |  |  |  |  |  |  |  |  | 518,130 | 395,745 | 362,328
Depreciation |  |  |  |  |  |  |  |  | 91,708 | 91,269 | 89,150
Operating Segments | Oil and Gas Infrastructure Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,866,642 | 2,800,824 | 2,635,147
Operating income (loss) |  |  |  |  |  |  |  |  | 184,083 | 149,502 | 142,929
Depreciation |  |  |  |  |  |  |  |  | 76,355 | 67,374 | 65,315
Consolidated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (323,364) | (224,434) | (267,754)
Depreciation |  |  |  |  |  |  |  |  | $ 15,745 | $ 11,597 | $ 8,380

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