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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

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=56944662&loc=d3e3602-108585

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X

- 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=26872669&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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