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Business and Organization - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 30, 2014 Entity | Jun. 30, 2014 Entity | Mar. 31, 2014 Entity | Sep. 30, 2014 Segment Entity | Sep. 30, 2013 | Dec. 31, 2013 Entity | Aug. 05, 2014 Oil and Gas Infrastructure Services Business [Member] Canada [Member] Entity | Mar. 31, 2014 Oil and Gas Infrastructure Services Business [Member] United States [Member] Entity | Dec. 31, 2013 Oil and Gas Infrastructure Services Business [Member] Us Canada Australia [Member] Entity | Mar. 31, 2014 Electric Power Infrastructure Services Business [Member] Canada [Member] Entity | Jul. 10, 2014 Electric Power Infrastructure Services Business [Member] Australia [Member] Entity | Jun. 30, 2014 Electric Power Infrastructure Services Business [Member] United States [Member] Entity | Dec. 31, 2013 Electric Power Infrastructure Services Business [Member] Us Canada Australia [Member] Entity
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  | 3 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Number of business acquisitions | 2 | 1 | 5 | 8 |  | 6 | 1 | 1 | 3 | 4 | 1 | 1 | 3

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- Definition Maximum licensing terms. + References No definition available. + Details
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- Definition Minimum licensing terms. + References No definition available. + Details
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- Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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