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