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Income Taxes - Deferred income tax assets and liabilities (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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| Deferred Tax Assets, Net [Abstract] | ||
| Compensation accruals | $ 3,121,734 | $ 2,151,789 |
| Reserves | 3,110,186 | 2,603,512 |
| Other accruals | 2,343,662 | 1,302,684 |
| Net operating losses | 345,350 | 267,996 |
| Interest rate swaps | 1,073,383 | 3,125,847 |
| Energy efficiency | 9,524,077 | 1,225,197 |
| Deferred revenue | 1,623,608 | 1,336,827 |
| Gross deferred income tax assets | 21,142,000 | 12,013,852 |
| Valuation allowance | (1,952,761) | (2,827,444) |
| Total deferred income tax assets | 19,189,239 | 9,186,408 |
| Deferred tax liabilities: | ||
| Depreciation | (23,504,155) | (26,839,863) |
| Contract refinancing | (709,773) | (725,328) |
| Acquisition accounting | (242,326) | (368,878) |
| Total deferred income tax liabilities | (25,665,010) | (28,883,919) |
| Deferred income tax liabilities, net | (6,475,771) | (19,697,511) |
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CANADA
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| Deferred tax liabilities: | ||
| Foreign Authority | (443,666) | (949,850) |
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UNITED KINGDOM
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| Deferred tax liabilities: | ||
| Foreign Authority | $ (765,090) | $ 0 |
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- Definition
Deferred Tax Assets, Deferred Revenue No definition available.
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- Definition
Deferred Tax Liabilities, Acquisition Accounting No definition available.
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- Definition
Deferred Tax Liabilities, Contract Refinancing No definition available.
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- Definition
Deferred Tax Liabilities, Foreign Authority No definition available.
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reserves other than estimated credit losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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