Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets- Goodwill (Details)

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Goodwill and Intangible Assets- Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Goodwill [Roll Forward]    
Balance, December 31, 2013 $ 53,074  
Goodwill acquired during the year 7,729  
Fair value adjustment 641 [1]  
Currency effects (328)  
Balance, September 30, 2014 61,116  
Accumulated Goodwill Impairment (1,016) (1,016)
Decrease to the recorded fair value of certain acquired intangible assets (801)  
Deferred tax liabilities, goodwill and intangible Assets 160  
U.S. Regions
    
Goodwill [Roll Forward]    
Balance, December 31, 2013 24,759  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects 0  
Balance, September 30, 2014 24,759  
Accumulated Goodwill Impairment 0 0
U.S. Federal
    
Goodwill [Roll Forward]    
Balance, December 31, 2013 3,375  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects 0  
Balance, September 30, 2014 3,375  
Accumulated Goodwill Impairment 0 0
Canada
    
Goodwill [Roll Forward]    
Balance, December 31, 2013 4,124  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects (208)  
Balance, September 30, 2014 3,916  
Accumulated Goodwill Impairment (1,016) (1,016)
Small-Scale Infrastructure
    
Goodwill [Roll Forward]    
Balance, December 31, 2013 0  
Goodwill acquired during the year 0  
Fair value adjustment 0  
Currency effects 0  
Balance, September 30, 2014 0  
Accumulated Goodwill Impairment 0 0
Other
    
Goodwill [Roll Forward]    
Balance, December 31, 2013 20,816  
Goodwill acquired during the year 7,729  
Fair value adjustment 641 [1]  
Currency effects (120)  
Balance, September 30, 2014 29,066  
Accumulated Goodwill Impairment $ 0 $ 0
[1] Fair value adjustment represents a final purchase accounting adjustment to decrease the recorded fair value of certain acquired intangible assets totaling $801, net of a $160 deferred tax liability adjustment, related to the Company’s prior year acquisition of The Energy Services Partnership Limited (now known as Ameresco Limited) and ESP Response Limited (together “ESP”).