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The Company - Additional Information (Detail) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | ||||||||
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May 28, 2014
acre
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Apr. 23, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Apr. 29, 2014
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May 23, 2013
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Apr. 23, 2013
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Sep. 30, 2014
AWCC [Member]
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Sep. 30, 2014
AWCC [Member]
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May 28, 2014
Solar [Member]
Project
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May 28, 2014
Wind [Member]
Project
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Oct. 31, 2014
Subsequent Event [Member]
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| Organization [Line Items] | ||||||||||||||
| Initial public offering, shares | 14,200,000 | |||||||||||||
| Net proceeds from offering | $ 160,000,000 | |||||||||||||
| Underwriters shares of common stock | 800,000 | |||||||||||||
| Share issued pursuant to underwriter | 750,000 | 600,000 | ||||||||||||
| First follow-on public offering, shares | 5,750,000 | 4,600,000 | ||||||||||||
| First follow-on public offering, price per share | $ 13.00 | $ 13.60 | ||||||||||||
| Net proceeds from first follow-on from public offering | 70,400,000 | 58,900,000 | ||||||||||||
| Acquisition date | May 28, 2014 | |||||||||||||
| Business combination consideration paid | 106,700,000 | |||||||||||||
| Area of land acquired | 7,500 | |||||||||||||
| Acquisition related costs | 1,100,000 | |||||||||||||
| Number of solar projects | 3 | 57 | ||||||||||||
| Working capital adjustment | 200,000 | |||||||||||||
| Business combination cash consideration | 600,000 | 106,572,000 | ||||||||||||
| Cash consideration amortization period | 3 years | |||||||||||||
| Rental Income | 1,187,000 | 1,597,000 | 900,000 | 1,400,000 | ||||||||||
| Interest Income, Financing receivables | $ 6,234,000 | $ 4,581,000 | $ 16,081,000 | $ 10,676,000 | $ 700,000 | $ 900,000 | ||||||||