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Segment Information - Summarized Financial Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 1,762,574	$ 1,585,710
Operating income (loss)	90,495	119,291
Depreciation	36,865	31,880
Electric Power [Member]
Segment Reporting Information [Line Items]
Revenues	1,278,168	1,180,983
Operating income (loss)	144,412	132,550
Depreciation	17,564	14,923
Oil And Gas Infrastructure Services [Member]
Segment Reporting Information [Line Items]
Revenues	445,857	358,932
Operating income (loss)	(21,172)	10,357
Depreciation	13,215	11,265
Fiber Optic Licensing and Other [Member]
Segment Reporting Information [Line Items]
Revenues	38,549	45,795
Operating income (loss)	12,109	16,883
Depreciation	4,318	4,051
Corporate and Non-Allocated Costs [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(44,854)	(40,499)
Depreciation	$ 1,768	$ 1,641

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=31042434&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.

+ Details

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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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X

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