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Business and Organization - Additional Information (Detail)
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3 Months Ended | 6 Months Ended | 12 Months Ended | ||
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Jun. 30, 2014
Entity
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Mar. 31, 2014
Entity
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Jun. 30, 2014
Segment
Entity
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Jun. 30, 2013
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Dec. 31, 2013
Entity
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| 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 | 1 | 5 | 6 | 6 | |
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Electric Power Infrastructure Services Business [Member] | Canada [Member]
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| Organization And Description Of Business [Line Items] | |||||
| Number of business acquisitions | 4 | ||||
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Oil and Gas Infrastructure Services Business [Member] | United States [Member]
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| Organization And Description Of Business [Line Items] | |||||
| Number of business acquisitions | 1 | ||||