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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 1,713,737	$ 1,861,386
Operating income (loss)	37,294	84,150
Depreciation	41,170	39,398
Electric Power Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues	1,187,002	1,240,292
Operating income (loss)	87,324	108,992
Depreciation	22,945	20,917
Oil and Gas Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues	526,735	621,094
Operating income (loss)	5,841	24,147
Depreciation	15,801	16,469
Corporate and Non-Allocated Costs [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(55,871)	(48,989)
Depreciation	$ 2,424	$ 2,012

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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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=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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