Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Goodwill (Details)

v2.4.0.8
Goodwill and Intangible Assets - Goodwill (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Roll Forward]      
Beginning Balance $ 48,968,390 $ 47,881,346  
Goodwill acquired during the year 3,681,865 2,021,260  
Goodwill impairment 0 (1,016,325) 0
Currency effects 424,107 82,109  
Ending Balance 53,074,362 48,968,390 47,881,346
Goodwill, Impaired, Accumulated Impairment Loss (1,016,325) (1,016,325)  
Percent of goodwill fair value that exceeds carrying value 11.00%    
Other U.S Regions
      
Goodwill [Roll Forward]      
Beginning Balance 23,708,555 23,708,555  
Goodwill acquired during the year 1,050,303 0  
Goodwill impairment   0  
Currency effects 0 0  
Ending Balance 24,758,858 23,708,555  
Goodwill, Impaired, Accumulated Impairment Loss 0 0  
U.S Federal
      
Goodwill [Roll Forward]      
Beginning Balance 3,374,967 3,374,967  
Goodwill acquired during the year 0 0  
Goodwill impairment   0  
Currency effects 0 0  
Ending Balance 3,374,967 3,374,967  
Goodwill, Impaired, Accumulated Impairment Loss 0 0  
Canada
      
Goodwill [Roll Forward]      
Beginning Balance 3,827,112 2,874,383  
Goodwill acquired during the year 0 1,886,945  
Goodwill impairment   (1,016,325)  
Currency effects 296,622 82,109  
Ending Balance 4,123,734 3,827,112  
Goodwill, Impaired, Accumulated Impairment Loss (1,016,325) (1,016,325)  
Small-Scale Infrastructure
      
Goodwill [Roll Forward]      
Beginning Balance 0 0  
Goodwill acquired during the year 0 0  
Goodwill impairment   0  
Currency effects 0 0  
Ending Balance 0 0  
Goodwill, Impaired, Accumulated Impairment Loss 0 0  
All Other
      
Goodwill [Roll Forward]      
Beginning Balance 18,057,756 17,923,441  
Goodwill acquired during the year 2,631,562 134,315  
Goodwill impairment   0  
Currency effects 127,485 0  
Ending Balance 20,816,803 18,057,756  
Goodwill, Impaired, Accumulated Impairment Loss $ 0 $ 0  
Minimum
      
Goodwill [Roll Forward]      
Intangible assets amortization period 1 year    
Minimum | Customer contracts
      
Goodwill [Roll Forward]      
Intangible assets amortization period 1 year    
Minimum | Customer Relationships, Noncompete Agreements, Technology and Trade Names
      
Goodwill [Roll Forward]      
Intangible assets amortization period 4 years    
Maximum
      
Goodwill [Roll Forward]      
Intangible assets amortization period 14 years    
Maximum | Customer contracts
      
Goodwill [Roll Forward]      
Intangible assets amortization period 5 years    
Maximum | Customer Relationships, Noncompete Agreements, Technology and Trade Names
      
Goodwill [Roll Forward]      
Intangible assets amortization period 14 years