Organization - Additional Information (Detail)
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Sep. 30, 2016 |
| Pattern Development [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Interest in the Company by Pattern Development |
19.00%
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| Hatchet Ridge [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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| St Josephs [Member] |
|
| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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| Spring Valley [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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| Pattern Santa Isabel LLC [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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| Ocotillo [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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| Pattern Gulf Wind LLC [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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| Lost Creek Wind, LLC [Member] |
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| Schedule Of Description Of Business [Line Items] |
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| Ownership Percentage |
100.00%
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