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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

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- 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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- 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 + Details
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