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Summary of Significant Accounting Policies - Summary of Noncontrolling Interest Balances (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
|
Dec. 31, 2013
|
Jun. 25, 2014
E1 Arrayan [Member]
|
Dec. 31, 2013
E1 Arrayan [Member]
|
Sep. 30, 2014
Noncontrolling Interest [Member]
|
Dec. 31, 2013
Noncontrolling Interest [Member]
|
Sep. 30, 2014
Noncontrolling Interest [Member]
Gulf Wind [Member]
|
Dec. 31, 2013
Noncontrolling Interest [Member]
Gulf Wind [Member]
|
Sep. 30, 2014
Noncontrolling Interest [Member]
E1 Arrayan [Member]
|
Dec. 31, 2013
Noncontrolling Interest [Member]
E1 Arrayan [Member]
|
Sep. 30, 2014
Noncontrolling Interest [Member]
Panhandle 1 [Member]
|
Dec. 31, 2013
Noncontrolling Interest [Member]
Panhandle 1 [Member]
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Noncontrolling Interest [Line Items] | ||||||||||||
| Non controlling Interest | $ 334,378 | $ 99,794 | $ 334,378 | $ 99,794 | $ 89,139 | $ 99,794 | $ 37,262 | $ 207,977 | ||||
| Percentage of ownership | 70.00% | 31.50% | 60.00% | 60.00% | 30.00% | 21.00% |