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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 2,417,576	$ 2,178,170
Operating income (loss)	75,221	75,074
Depreciation	48,719	42,693
Electric Power Infrastructure Services
Segment Reporting Information [Line Items]
Revenues	1,568,507	1,219,502
Operating income (loss)	140,895	99,672
Depreciation	24,270	22,086
Oil and Gas Infrastructure Services
Segment Reporting Information [Line Items]
Revenues	849,069	958,668
Operating income (loss)	10,057	38,817
Depreciation	20,695	17,364
Corporate and non-allocated costs
Segment Reporting Information [Line Items]
Operating income (loss)	(75,731)	(63,415)
Depreciation	$ 3,754	$ 3,243

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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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

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