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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 2,042,186	$ 1,939,438	$ 5,548,353	$ 5,673,164
Operating income (loss)	130,163	80,878	202,926	233,879
Depreciation	42,678	40,954	126,607	121,382
Electric Power Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues	1,222,432	1,183,151	3,568,521	3,645,767
Operating income (loss)	118,998	76,948	282,256	273,967
Depreciation	22,906	22,801	68,788	65,790
Oil and Gas Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues	819,754	756,287	1,979,832	2,027,397
Operating income (loss)	65,661	58,874	83,401	119,002
Depreciation	17,296	16,347	50,351	49,599
Corporate and Non-Allocated Costs [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(54,496)	(54,944)	(162,731)	(159,090)
Depreciation	$ 2,476	$ 1,806	$ 7,468	$ 5,993

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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X

- Definition

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

+ References

No definition available.

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X

- 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.

+ References

No definition available.

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