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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

X

- 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=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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