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Business and Organization - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Entity
Dec. 31, 2011
Entity
Dec. 31, 2013
Segment
Entity
Dec. 31, 2012
Entity
Dec. 31, 2011
Entity
Organization And Description Of Business [Line Items]          
Number of reportable segments     3    
Fiber Optic Licensing Terms, Minimum in years     5 years 5 years  
Fiber Optic Licensing Terms, Maximum in years     25 years 25 years  
Number of business acquisitions completed 4 5 6 4 5
Proceeds from sale of subsidiary       $ 265.0  
Electric Power Division [Member] | Canada [Member]
          
Organization And Description Of Business [Line Items]          
Number of business acquisitions completed 1 3     3
Electric Power Division [Member] | United States [Member]
          
Organization And Description Of Business [Line Items]          
Number of business acquisitions completed 2 1     1
Oil and Gas Infrastructure Division [Member] | United States [Member]
          
Organization And Description Of Business [Line Items]          
Number of business acquisitions completed 1        
Oil and Gas Infrastructure Division [Member] | Australia [Member]
          
Organization And Description Of Business [Line Items]          
Number of business acquisitions completed   1     1