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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,102,966 | $ 2,042,186 | $ 1,792,430 | $ 1,713,737 | $ 1,899,272 | $ 1,939,438 | $ 1,872,340 | $ 1,861,386 | $ 7,651,319 | $ 7,572,436 | $ 7,747,229
Operating income (loss) |  |  |  |  |  |  |  |  | 320,813 | 237,503 | 429,060
Depreciation |  |  |  |  |  |  |  |  | 170,240 | 162,845 | 141,106
Electric Power Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,850,495 | 4,937,289 | 5,302,671
Operating income (loss) |  |  |  |  |  |  |  |  | 395,745 | 362,328 | 462,985
Depreciation |  |  |  |  |  |  |  |  | 91,269 | 89,150 | 76,214
Oil and Gas Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,800,824 | 2,635,147 | 2,444,558
Operating income (loss) |  |  |  |  |  |  |  |  | 149,502 | 142,929 | 162,797
Depreciation |  |  |  |  |  |  |  |  | 67,374 | 65,315 | 57,414
Corporate and Non-Allocated Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (224,434) | (267,754) | (196,722)
Depreciation |  |  |  |  |  |  |  |  | $ 11,597 | $ 8,380 | $ 7,478

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