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Segment Information (Summarized Financial Information) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 1,685,201 | $ 1,250,819 | $ 4,627,074 | $ 3,110,692
Operating income (loss) | 145,654 | 93,981 | 336,276 | 124,795
Depreciation | 32,443 | 29,135 | 94,086 | 86,499
Electric Power [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,089,256 | 822,689 | 3,037,000 | 2,056,232
Operating income (loss) | 136,378 | 100,199 | 356,863 | 198,661
Depreciation | 14,075 | 12,474 | 40,907 | 37,080
Natural Gas And Pipeline [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 397,459 | 259,014 | 1,096,247 | 645,495
Operating income (loss) | 23,207 | (4,035) | 27,498 | (42,263)
Depreciation | 11,137 | 10,332 | 32,187 | 31,020
Telecommunications [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 169,858 | 140,679 | 409,436 | 326,494
Operating income (loss) | 22,224 | 15,832 | 44,420 | 21,238
Depreciation | 1,971 | 1,526 | 5,556 | 4,412
Fiber Optic Licensing [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 28,628 | 28,437 | 84,391 | 82,471
Operating income (loss) | 14,092 | 14,231 | 42,919 | 39,448
Depreciation | 3,568 | 3,468 | 10,446 | 10,321
Corporate And Non-allocated Costs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (50,247) | (32,246) | (135,424) | (92,289)
Depreciation | $ 1,692 | $ 1,335 | $ 4,990 | $ 3,666

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