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Business Segment Information - Revenue (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Segment Reporting [Abstract] | |||||||||||
| Energy efficiency projects | $ 369,510,858 | $ 448,983,992 | $ 551,323,840 | ||||||||
| Renewable energy | 204,660,391 | 182,186,573 | 176,876,478 | ||||||||
| Revenues | $ 176,134,000 | $ 161,649,000 | $ 126,253,000 | $ 110,136,000 | $ 156,591,000 | $ 163,906,000 | $ 164,100,000 | $ 146,573,000 | $ 574,171,249 | $ 631,170,565 | $ 728,200,318 |
| X | ||||||||||
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- Definition
Renewable energy revenue No definition available.
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| X | ||||||||||
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- Definition
Revenue derived from energy-related services such as supplying various forms of energy from the operation of on-site facilities or cogeneration plants and procurement services provided to energy purchasers. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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