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Segment Information - Summarized Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,673,342 | $ 1,532,001 | $ 1,386,162 | $ 1,328,764 | $ 1,393,004 | $ 1,112,674 | $ 904,781 | $ 783,305 | $ 5,920,269 | $ 4,193,764 | $ 3,629,433
Operating income (loss) |  |  |  |  |  |  |  |  | 465,122 | 194,842 | 243,991
Depreciation |  |  |  |  |  |  |  |  | 120,303 | 109,874 | 101,199
Electric Power [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,206,509 | 3,022,659 | 2,028,734
Operating income (loss) |  |  |  |  |  |  |  |  | 520,834 | 337,726 | 204,088
Depreciation |  |  |  |  |  |  |  |  | 55,205 | 49,038 | 40,249
Natural Gas and Pipeline [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,534,713 | 1,011,248 | 1,392,824
Operating income (loss) |  |  |  |  |  |  |  |  | 55,410 | (78,307) | 118,816
Depreciation |  |  |  |  |  |  |  |  | 43,285 | 41,051 | 43,407
Fiber Optic Licensing and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 179,047 | 159,857 | 207,875
Operating income (loss) |  |  |  |  |  |  |  |  | 61,299 | 53,476 | 52,952
Depreciation |  |  |  |  |  |  |  |  | 15,173 | 14,736 | 13,749
Corporate and non-allocated costs [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (172,421) | (118,053) | (131,865)
Depreciation |  |  |  |  |  |  |  |  | $ 6,640 | $ 5,049 | $ 3,794

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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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3602-108585 + Details
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