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Debt - Convertible Subordinated Notes to Affiliates (Details) - USD ($) | Jan. 31, 2017 | Jan. 08, 2017 | Oct. 05, 2016 | Jul. 31, 2015 | Jul. 08, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | May 12, 2015 | Aug. 01, 2014 | May 29, 2014 | Apr. 22, 2014
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible subordinated notes to affiliates | [1] |  |  |  |  |  | $ 6,582,000 | $ 0 |  |  |  |
Current portion of Senior Credit Facility | [1] |  |  |  |  |  | $ 15,501,000 | $ 0 |  |  |  |
Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  | $ 0.01
Shares issued, price per share (in dollars per share) |  |  |  |  | $ 16.21 |  |  |  |  |  |  |
Censtar Convertible Debt | Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, irrevocable commitment to convert (in shares) |  |  |  | 383,090 |  |  |  |  |  |  |  |
Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, minimum borrowing capacity |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |
Convertible Subordinated Notes | Censtar Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated percentage interest rate |  |  |  |  |  | 5.00% |  |  |  |  |  |
Exercise of conversion rights term |  |  |  |  |  | 18 months |  |  |  |  |  |
Convertible Subordinated Notes | Censtar Convertible Debt | Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share (in dollars per share) |  |  |  |  |  | $ 16.57 |  |  |  |  |  |
Convertible Subordinated Notes | Censtar Convertible Debt | CenStar |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible subordinated notes to affiliates |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |
Convertible Subordinated Notes | Oasis Note |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated percentage interest rate |  |  |  |  | 5.00% |  |  |  |  |  |  |
Conversion price per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 14.00 |  |  |
Exercise of conversion rights term |  |  |  |  | 18 months |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  | $ 800,000 |  |  |  |  |  |  |
Convertible Subordinated Notes | Oasis Note | Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share (in dollars per share) |  |  |  |  | $ 14.00 |  |  |  |  |  |  |
Convertible Subordinated Notes | Oasis Note | Oasis |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible subordinated notes to affiliates |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Major Energy Companies | Trade Credit Arrangements With Pacific Summit Energy LLC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current portion of Senior Credit Facility |  |  |  |  |  |  | $ 15,501,000 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  | 4.00% |  |  |  |  |
Subsequent Event | Censtar Convertible Debt | Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, irrevocable commitment to convert (in shares) |  |  | 134,731 |  |  |  |  |  |  |  |  |
Subsequent Event | Oasis Note | Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, irrevocable commitment to convert (in shares) |  | 383,090 |  |  |  |  |  |  |  |  |  |
[1] | See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.

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