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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,899,272 | $ 1,939,438 | $ 1,872,340 | $ 1,861,386 | $ 2,027,614 | $ 2,145,958 | $ 1,838,209 | $ 1,735,448 | $ 7,572,436 | $ 7,747,229 | $ 6,411,577
Operating income (loss) |  |  |  |  |  |  |  |  | 237,503 | 429,060 | 475,999
Depreciation |  |  |  |  |  |  |  |  | 162,845 | 141,106 | 118,830
Electric Power Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,937,289 | 5,302,671 | 4,541,962
Operating income (loss) |  |  |  |  |  |  |  |  | 362,328 | 462,985 | 523,355
Depreciation |  |  |  |  |  |  |  |  | 89,150 | 76,214 | 64,913
Oil and Gas Infrastructure Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,635,147 | 2,444,558 | 1,869,615
Operating income (loss) |  |  |  |  |  |  |  |  | 142,929 | 162,797 | 138,543
Depreciation |  |  |  |  |  |  |  |  | 65,315 | 57,414 | 47,050
Corporate and Non-Allocated Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (267,754) | (196,722) | (185,899)
Depreciation |  |  |  |  |  |  |  |  | $ 8,380 | $ 7,478 | $ 6,867

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