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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 2,609,307	$ 2,042,186	$ 6,987,851	$ 5,548,353
Operating income (loss)	140,428	130,163	325,293	202,926
Depreciation	48,426	42,678	135,769	126,607
Electric Power Infrastructure Services
Segment Reporting Information [Line Items]
Revenues	1,504,752	1,222,432	4,024,983	3,568,521
Operating income (loss)	150,054	118,998	362,769	282,256
Depreciation	23,996	22,906	68,232	68,788
Oil and Gas Infrastructure Services
Segment Reporting Information [Line Items]
Revenues	1,104,555	819,754	2,962,868	1,979,832
Operating income (loss)	58,508	65,661	165,076	83,401
Depreciation	20,737	17,296	56,235	50,351
Corporate and non-allocated costs
Segment Reporting Information [Line Items]
Operating income (loss)	(68,134)	(54,496)	(202,552)	(162,731)
Depreciation	$ 3,693	$ 2,476	$ 11,302	$ 7,468

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=98514028&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.

+ References

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