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Segment Information - Summarized Financial Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 1,645,132	$ 1,532,001	$ 4,705,219	$ 4,246,927
Operating income	141,078	127,133	377,543	304,269
Depreciation	33,873	30,713	98,793	89,115
Electric Power [Member]
Segment Reporting Information [Line Items]
Revenues	1,048,370	1,088,586	3,275,732	3,026,872
Operating income	122,413	137,445	375,772	362,394
Depreciation	16,343	14,039	47,042	40,749
Natural Gas and Pipeline [Member]
Segment Reporting Information [Line Items]
Revenues	552,380	394,215	1,297,254	1,088,777
Operating income	49,873	23,429	87,874	27,949
Depreciation	11,514	11,103	34,114	32,093
Fiber Optic Licensing and Other [Member]
Segment Reporting Information [Line Items]
Revenues	44,382	49,200	132,233	131,278
Operating income	14,105	15,114	45,289	45,077
Depreciation	4,281	3,880	12,562	11,282
Corporate and Non-Allocated Costs [Member]
Segment Reporting Information [Line Items]
Operating income	(45,313)	(48,855)	(131,392)	(131,151)
Depreciation	$ 1,735	$ 1,691	$ 5,075	$ 4,991

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

+ Details

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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



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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