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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Schedule of Ownership Interests Percentage | Subsequent to the IPO through December 31, 2016, the Company and NuDevco owned the following economic interests in Spark HoldCo:
| The Company | NuDevco Retail and Retailco (1)
From the IPO to December 31, 2014 | 21.82% | 78.18%
On December 31, 2015 | 22.49% | 77.51%
On December 31, 2016 | 38.85% | 61.15%
(1) In January 2016, Retailco succeeded to the interest of NuDevco Retail Holdings of its Class B common stock and in equal number of Spark HoldCo units it held pursuant to a series of transfers.
The Company and NuDevco Retail and Retailco owned the following economic interests in Spark HoldCo at December 31, 2015 and December 31, 2016, respectively.
Non-controlling Interest Economic Interest |  |
| The Company | NuDevco Retail and Retailco (1)
December 31, 2015 | 22.49 | % | 77.51 | %
December 31, 2016 | 38.85 | % | 61.15 | %
(1) In January 2016, Retailco succeeded to the interest of NuDevco Retail Holdings of its Class B common stock and in equal number of Spark HoldCo units it held pursuant to a series of transfers.

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- Definition Tabular disclosure of sales of stock or previously unissued stock made by subsidiary or equity method investee to investors outside the consolidated group. This includes stock issued in a business combination in exchange for shares of an acquired entity. + References No definition available. + Details
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