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Segment Information - Summarized Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 1,864,550 | $ 1,474,377 | $ 3,627,124 | $ 3,060,087
Operating income (loss) | 133,393 | 117,174 | 223,888 | 236,465
Depreciation | 37,996 | 33,040 | 74,861 | 64,920
Electric Power Infrastructure [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,239,168 | 1,046,379 | 2,517,336 | 2,227,362
Operating income (loss) | 112,069 | 120,809 | 256,481 | 253,359
Depreciation | 18,271 | 15,776 | 35,835 | 30,699
Oil And Gas Infrastructure Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 585,367 | 385,942 | 1,031,224 | 744,874
Operating income (loss) | 55,583 | 27,644 | 34,411 | 38,001
Depreciation | 13,465 | 11,335 | 26,680 | 22,600
Fiber Optic Licensing and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 40,015 | 42,056 | 78,564 | 87,851
Operating income (loss) | 14,146 | 14,301 | 26,255 | 31,184
Depreciation | 4,445 | 4,230 | 8,763 | 8,281
Corporate and Non-Allocated Costs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (48,405) | (45,580) | (93,259) | (86,079)
Depreciation | $ 1,815 | $ 1,699 | $ 3,583 | $ 3,340

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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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