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Business and Organization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Entity | Dec. 31, 2011 Entity
Organization And Description Of Business [Line Items] |  |
Fiber Optic Licensing Terms, Minimum in years | 5 years |
Fiber Optic Licensing Terms, Maximum in years | 25 years |
Number of business acquisitions completed | 4 | 5
Proceeds from sale of subsidiary | $ 265 |
Electric Power Division [Member] | Canada [Member] |  |
Organization And Description Of Business [Line Items] |  |
Number of business acquisitions completed | 1 | 3
Electric Power Division [Member] | United States [Member] |  |
Organization And Description Of Business [Line Items] |  |
Number of business acquisitions completed | 2 | 1
Natural Gas and Pipeline Division [Member] | United States [Member] |  |
Organization And Description Of Business [Line Items] |  |
Number of business acquisitions completed | 1 |
Natural Gas and Pipeline Division [Member] | Australia [Member] |  |
Organization And Description Of Business [Line Items] |  |
Number of business acquisitions completed |  | 1

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- Definition Licensing terms maximum in years. + References No definition available. + Details
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- Definition Licensing terms minimum in years. + References No definition available. + Details
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- Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -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. + Details
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