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Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended 3 Months Ended
Jun. 30, 2012
Entity
Dec. 31, 2011
Entity
Dec. 31, 2013
Entity
Dec. 31, 2012
Entity
Dec. 31, 2011
Entity
Mar. 31, 2014
Subsequent Event [Member]
Entity
Mar. 31, 2014
Series G Preferred Stock [Member]
Subsequent Event [Member]
Mar. 31, 2014
Canada [Member]
Electric Power Infrastructure Services Business [Member]
Subsequent Event [Member]
Entity
Mar. 31, 2014
United States [Member]
General Engineering And Construction Company [Member]
Subsequent Event [Member]
Entity
Mar. 31, 2014
Canadian Subsidiaries [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]                    
Number of business acquisitions 4 5 6 4 5 5   4 1  
Cash paid for acquisition     $ 341,100     $ 79,900        
Number of shares issued for acquisition of company 1,927,113 1,939,813 3,547,482 1,927,113 1,939,813 393,051 1     899,858
Common stock value $ 37,291 $ 32,400 $ 88,895 $ 37,291 $ 32,400 $ 36,600