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Equity (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 vote shares | May. 04, 2015 | Dec. 31, 2014 shares
Class of Stock [Line Items] |  |  |
Preferred stock authorized | 20,000,000 |  | 20,000,000
Preferred stock shares issued | 0 |  | 0
Preferred stock shares outstanding | 0 |  | 0
Spark HoldCo |  |  |
Class of Stock [Line Items] |  |  |
Noncontrolling interest ownership percentage | 22.37% | 21.82% |
Noncontrolling interest ownership percentage by noncontrolling owners | 77.63% | 78.18% |
Common Class A |  |  |
Class of Stock [Line Items] |  |  |
Common stock outstanding | 3,097,193 |  | 3,000,000
Common stock voting rights | vote | 1 |  |
Common Class B |  |  |
Class of Stock [Line Items] |  |  |
Common stock outstanding | 10,750,000 |  | 10,750,000
Common stock voting rights | vote | 1 |  |

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