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Business Acquisitions and Related Transactions - Purchase Price Allocation (Details) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | |||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Jul. 31, 2011
AEG [Member]
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Aug. 31, 2011
Ameresco Southwest [Member]
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Dec. 31, 2011
AIS [Member]
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Jul. 31, 2012
FAME [Member]
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| Business Acquisition [Line Items] | ||||||||
| Cash | $ 314,642 | $ 0 | $ 0 | $ 809,557 | ||||
| Accounts receivable | 4,138,015 | 14,149,703 | 0 | 320,997 | ||||
| Costs and estimated earnings in excess of billings | 0 | 11,269,294 | 163,340 | 0 | ||||
| Inventory | 0 | 0 | 47,193 | 0 | ||||
| Prepaid expenses and other current assets | 62,345 | 33,329 | 0 | 107,715 | ||||
| Project development costs | 0 | 0 | 130,044 | 0 | ||||
| Property and equipment and project assets | 7,301 | 6,447,299 | 216,297 | 43,115 | ||||
| Goodwill | 8,728,169 | 16,545,434 | 1,549,467 | 2,291,163 | ||||
| Intangible assets | 4,904,000 | 7,019,000 | 2,557,000 | 1,712,021 | ||||
| Other assets | 52,062 | 0 | 0 | 100 | ||||
| Accounts payable | (1,610,734) | (1,992,748) | 0 | (5,713) | ||||
| Accrued liabilities | (1,011,032) | (3,414,198) | (65,627) | (600,156) | ||||
| Billings in excess of cost and estimated earnings | 0 | 0 | (100,573) | (160,939) | ||||
| Deferred taxes and other liabilities | (3,591,532) | 0 | 0 | (30,910) | ||||
| Purchase price | 11,993,236 | 50,057,113 | 4,497,141 | 4,486,950 | ||||
| Total, net of cash received | 3,677,393 | 60,953,588 | 3,677,393 | 60,953,588 | 11,678,594 | 50,057,113 | 4,497,141 | 3,677,393 |
| Total fair value of consideration | $ 11,993,236 | $ 50,057,113 | $ 4,497,141 | $ 4,486,950 | ||||
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- Definition
Business Acquisition, Purchase Price Allocation, Current Assets, Costs and Estimated Earnings in Excess of Billings No definition available.
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- Definition
Business Acquisition, Purchase Price Allocation, Current Assets, Project Development Costs No definition available.
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- Definition
Business Acquisition, Purchase Price Allocation, Current Liabilities, Billings in Excess of Cost and Estimated Earnings No definition available.
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- Definition
Business Acquisition, Purchase Price Allocation, Deferred Tax Liabilities and Other Liabilities, Noncurrent No definition available.
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- Definition
The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of cash and cash equivalents acquired in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of acquisition cost of a business combination allocated to prepaid expenses and other current assets. Does not include amounts allocated to cash and cash equivalents, marketable securities, receivables, inventory, and assets not to be used. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of acquisition cost of a business combination allocated to receivables. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of acquisition cost of a business combination allocated to accounts payable of the acquired entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of acquisition cost of a business combination allocated to accrued expenses of the acquired entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of acquisition cost of a business combination allocated to other noncurrent assets not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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