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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
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