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Acquisitions - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Entity
Dec. 31, 2011
Entity
Dec. 31, 2013
Entity
Dec. 31, 2012
Entity
Dec. 31, 2011
Entity
Business Acquisition [Line Items]          
Number of business acquisitions completed 4 5 6 4 5
Number of shares issued for acquisition of company 1,927,113 1,939,813 3,547,482 1,927,113 1,939,813
Common stock value $ 37,291,000 $ 32,400,000 $ 88,895,000 $ 37,291,000 $ 32,400,000
Cash paid for acquisition     341,100,000    
Cash paid for acquisition 57,500,000 80,800,000   57,500,000 80,800,000
Payment of cash to repay acquiree debt 11,000,000 3,400,000   11,000,000 3,400,000
Accounts receivables with fair value 15,300,000   83,900,000    
Goodwill acquired     255,806,000 64,779,000  
Revenues contributed by acquisitions     251,300,000 125,700,000 43,800,000
Income before income taxes contributed by acquisitions     18,200,000 6,200,000 4,400,000
Acquisitions [Member]
          
Business Acquisition [Line Items]          
Goodwill expected to be deductible for income tax 52,900,000   213,600,000    
Electric Power Division [Member]
          
Business Acquisition [Line Items]          
Goodwill acquired     112,549,000 57,451,000  
Electric Power Division [Member] | Canada [Member]
          
Business Acquisition [Line Items]          
Number of business acquisitions completed 1 3     3
Electric Power Division [Member] | United States [Member]
          
Business Acquisition [Line Items]          
Number of business acquisitions completed 2 1     1
Electric Power Division [Member] | Acquisitions [Member]
          
Business Acquisition [Line Items]          
Goodwill acquired     112,500,000 57,500,000  
Oil and Gas Infrastructure Division [Member]
          
Business Acquisition [Line Items]          
Goodwill acquired     143,257,000 7,328,000  
Oil and Gas Infrastructure Division [Member] | United States [Member]
          
Business Acquisition [Line Items]          
Number of business acquisitions completed 1        
Oil and Gas Infrastructure Division [Member] | Australia [Member]
          
Business Acquisition [Line Items]          
Number of business acquisitions completed   1     1
Oil and Gas Infrastructure Division [Member] | Acquisitions [Member]
          
Business Acquisition [Line Items]          
Goodwill acquired     $ 143,300,000 $ 7,300,000