Annual report pursuant to Section 13 and 15(d)

Business Acquisitions and Related Transactions - Purchase Price Allocation (Details)

v2.4.0.8
Business Acquisitions and Related Transactions - Purchase Price Allocation (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
FAME
Jul. 31, 2012
FAME
Dec. 31, 2012
AEG
Aug. 31, 2011
AEG
Dec. 31, 2011
Ameresco Southwest
Dec. 31, 2012
Ameresco Southwest
Dec. 31, 2011
AIS
Jul. 31, 2012
AIS
Dec. 31, 2013
ESP
Dec. 31, 2013
Ennovate
Business Acquisition [Line Items]                          
Cash       $ 809,557   $ 314,642   $ 0   $ 0   $ 1,291,697 $ 0
Accounts receivable       320,997   4,138,015   14,149,703   0   360,924 411,128
Costs and estimated earnings in excess of billings       0   0   11,269,294   163,340   546,608 117,468
Inventory       0   0   0   47,193   0 0
Prepaid expenses and other current assets       107,715   62,345   33,329   0   1,166,565 1,710
Project development costs       0   0   0   130,044   0 0
Property and equipment and project assets       43,115   7,301   6,447,299   216,297   75,054 62,897
Goodwill 53,074,362 48,968,390 47,881,346 1,886,945 1,886,945 8,728,169 8,728,169 16,545,434 16,545,434 1,549,467 1,549,467 2,631,562 1,050,303
Intangible assets(1)       2,099,990 [1]   4,904,000 [1]   7,019,000 [1]   2,557,000 [1]   4,504,496 [1] 595,000 [1]
Other assets       100   52,062   0   0   0 0
Accounts payable       (5,713)   (1,610,734)   (1,992,748)   0   (47,625) (365,060)
Accrued liabilities       (617,731)   (1,011,032)   (3,414,198)   (65,627)   (606,938) 0
Billings in excess of cost and estimated earnings       (158,025)   0   0   (100,573)   0 (107,890)
Deferred taxes and other liabilities       0   (3,591,532)   0   0   (1,157,837) 0
Purchase price       4,486,950   11,993,236   50,057,113   4,497,141   8,764,506  
Total, net of cash received 9,837,740 4,012,459 66,232,848 3,677,393   11,678,594   50,057,113   4,497,141   7,472,809 1,765,556
Total fair value of consideration       $ 4,486,950   $ 11,993,236   $ 50,057,113   $ 4,497,141   $ 8,764,506 $ 1,765,556
[1] Intangible assets acquired in 2013 consisted of customer contracts, customer relationships and non-compete assets of $5,099,496 and were assigned a weighted average useful life of 5.9 years.