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Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interest (Details) - Spark HoldCo |  |  | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Aug. 01, 2014 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |
Economic interests percentage | 22.49% | 21.82% | 21.82% | 38.85% | 22.49%
NuDevco Retail and Retailco (1) |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Economic interests percentage | 77.51% | 78.18% | 78.18% | 61.15% |

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- Definition Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction. + References No definition available. + Details
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- Details
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