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Business and Organization - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2012
Organization And Description Of Business [Line Items] |  |  |  |
Fiber Optic Licensing Terms, Minimum in years | 5 years |  | 5 years | 5 years
Fiber Optic Licensing Terms, Maximum in years | 25 years |  | 25 years | 25 years
Cash paid for acquisition |  | $ 20.3 | $ 37.2 |
Number of shares issued for acquisition of company |  | 662,426 | 1,264,687 |
Common stock value |  | 12.5 | 24.8 |
Payment of cash to repay acquiree debt |  | 5.9 | 5.1 |
Proceeds from sale of subsidiary |  |  |  | $ 265.0
Electric Power Division [Member] | United States [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions completed |  | 1 | 1 |
Electric Power Division [Member] | Canada [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions completed |  |  | 1 |
Natural Gas and Pipeline Division [Member] | United States [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions completed |  |  | 1 |

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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 39 -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 FASB -Name Emerging Issues Task Force (EITF) -Number 88-16 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(4) -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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