Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

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Acquisitions - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Entity
Mar. 31, 2015
Entity
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Entity
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Entity
shares
Business Acquisition [Line Items]            
Cash paid for acquisitions       $ 64,700   $ 279,500
Aggregate consideration paid or payable for acquisitions       $ 65,700    
Number of business acquisitions | Entity 3 3   6   9
Number of shares granted for acquired companies | shares           686,382
Value of equity interests transferred           $ 134,500
Goodwill acquired       $ 30,310    
Fair value of accounts receivable acquired $ 10,300     10,300   117,200
Goodwill expected to be deductible for income tax 10,600     10,600   43,500
Income (loss) from continuing operations before income taxes 67,047   $ 119,035 150,038 $ 199,571  
Third and Fourth Quarter 2014 [Member]            
Business Acquisition [Line Items]            
Net tangible assets acquired           111,000
Goodwill acquired           107,300
Other intangible assets, acquired           $ 73,900
Two Thousand Fifteen Acquisitions [Member]            
Business Acquisition [Line Items]            
Net tangible assets acquired       20,600    
Goodwill acquired       30,300    
Other intangible assets, acquired 14,800     14,800    
Contributed by Acquisitions [Member]            
Business Acquisition [Line Items]            
Revenues 18,100     25,100    
Income (loss) from continuing operations before income taxes (300)     (1,200)    
Acquisition costs $ 1,300     $ 1,700    
Canadian Subsidiaries [Member] | Exchangeable Shares [Member]            
Business Acquisition [Line Items]            
Number of shares granted for acquired companies | shares           3,825,971
Series G Preferred Stock [Member]            
Business Acquisition [Line Items]            
Number of shares granted for acquired companies | shares           1
Series G Preferred Stock [Member] | Canadian Subsidiaries [Member] | Exchangeable Shares [Member]            
Business Acquisition [Line Items]            
Number of shares granted for acquired companies | shares           899,858
Electric Power Infrastructure Services Business [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity       4    
Electric Power Infrastructure Services Business [Member] | United States [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity 2     2   1
Electric Power Infrastructure Services Business [Member] | Canada [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity 1 1   2   4
Electric Power Infrastructure Services Business [Member] | Australia [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity           1
Oil and Gas Infrastructure Services Business [Member] | United States [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity           1
Oil and Gas Infrastructure Services Business [Member] | Canada [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity   1   1   2
Oil and Gas Infrastructure Services Business [Member] | Australia [Member]            
Business Acquisition [Line Items]            
Number of business acquisitions | Entity   1   1    
Electric Power Division [Member]            
Business Acquisition [Line Items]            
Goodwill acquired       $ 13,509   $ 72,300
Oil and Gas Infrastructure Division [Member]            
Business Acquisition [Line Items]            
Goodwill acquired       $ 16,801   $ 94,100