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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 1,939,438	$ 2,145,958	$ 5,673,164	$ 5,719,615
Operating income (loss)	80,878	131,284	233,879	331,413
Depreciation	40,954	36,485	121,382	103,239
Electric Power Infrastructure [Member]
Segment Reporting Information [Line Items]
Revenues	1,183,151	1,396,157	3,645,767	3,938,590
Operating income (loss)	76,948	104,365	273,967	361,689
Depreciation	22,801	19,406	65,790	55,896
Oil and Gas Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues	756,287	749,801	2,027,397	1,781,025
Operating income (loss)	58,874	74,824	119,002	109,235
Depreciation	16,347	15,146	49,599	41,826
Corporate and Non-Allocated Costs [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(54,944)	(47,905)	(159,090)	(139,511)
Depreciation	$ 1,806	$ 1,933	$ 5,993	$ 5,517

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)



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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=26872669&loc=d3e20235-122688

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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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