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Business and Organization - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jul. 31, 2013 Entity | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2012 Entity | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2013 Subsequent Event [Member] Entity | Jun. 30, 2012 Natural Gas and Pipeline Division [Member] United States [Member] Entity | Dec. 31, 2013 Natural Gas and Pipeline Division [Member] United States [Member] Subsequent Event [Member] Entity | Jul. 31, 2013 Natural Gas and Pipeline Division [Member] Australia [Member] Entity | Jul. 31, 2013 Electric Power Division [Member] United States [Member] Entity | Jun. 30, 2012 Electric Power Division [Member] United States [Member] Entity | Dec. 31, 2013 Electric Power Division [Member] United States [Member] Subsequent Event [Member] Entity | Jun. 30, 2012 Electric Power Division [Member] Canada [Member] Entity
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiber Optic Licensing Terms, Minimum in years |  | 5 years | 5 years |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |
Fiber Optic Licensing Terms, Maximum in years |  | 25 years | 25 years |  | 25 years | 25 years | 25 years |  |  |  |  |  |  |  |
Number of business acquisitions completed | 2 |  |  | 4 |  |  |  | 3 | 1 | 2 | 1 | 1 | 2 | 1 | 1
Cash paid for acquisition |  |  |  | $ 57,500,000 |  |  |  | $ 180,800,000 |  |  |  |  |  |  |
Common stock value | 18,700,000 |  |  | 37,300,000 |  |  |  | 69,300,000 |  |  |  |  |  |  |
Number of shares issued for acquisition of company | 763,272 |  |  | 1,927,113 |  |  |  | 2,747,412 |  |  |  |  |  |  |
Cash paid for acquisitions, net of cash acquired | 123,800,000 | 123,759,000 |  |  | 124,736,000 | 68,727,000 |  |  |  |  |  |  |  |  |
Payment of cash to repay acquiree debt |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of subsidiary |  |  |  |  |  |  | $ 265,000,000 |  |  |  |  |  |  |  |

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