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Subsequent Events - Acquisitions (Details) $ / shares in Units, customer in Thousands, $ in Millions | Jul. 31, 2015 USD ($) state customer $ / shares | Jul. 08, 2015 USD ($) customer $ / shares | Jun. 30, 2015 $ / shares | Dec. 31, 2014 $ / shares | Aug. 01, 2014 $ / shares
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Common Class B |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, par value | $ / shares |  |  | $ 0.01 | $ 0.01 | $ 0.01
Subsequent Event | Common Class B |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.01 |  |  |
Subsequent Event | Senior Secured Revolving Credit Facility |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Minimum availability of borrowing |  | $ 5.0 |  |  |
Subsequent Event | Convertible Debt [Member] | Censtar Convertible Debt |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Annual interest rate |  | 5.00% |  |  |
Exercise of conversion rights term |  | 18 months |  |  |
Subsequent Event | Convertible Debt [Member] | Censtar Convertible Debt | Common Class B |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion price per share | $ / shares |  | $ 16.57 |  |  |
Subsequent Event | Convertible Debt [Member] | Oasis Power Holdings Convertible Debt |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Annual interest rate | 5.00% |  |  |  |
Exercise of conversion rights term | 18 months |  |  |  |
Subsequent Event | Convertible Debt [Member] | Oasis Power Holdings Convertible Debt | Common Class B |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Conversion price per share | $ / shares | $ 14.00 |  |  |  |
Subsequent Event | CenStar |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of customers | customer |  | 75 |  |  |
Purchase price |  | $ 8.3 |  |  |
EBITDA attributable to operations earn-out percentage |  | 50.00% |  |  |
Subsequent Event | CenStar | Senior Secured Revolving Credit Facility |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Acquisition liabilities incurred |  | $ 6.2 |  |  |
Subsequent Event | CenStar | Convertible Debt [Member] | Censtar Convertible Debt |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Acquisition liabilities incurred |  | $ 2.1 |  |  |
Subsequent Event | Oasis Power Holdings |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of customers | customer | 40 |  |  |  |
Number of states in which company operates | state | 6 |  |  |  |
Purchase price | $ 20.0 |  |  |  |
Subsequent Event | Oasis Power Holdings | Senior Secured Revolving Credit Facility |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Acquisition liabilities incurred | 15.0 |  |  |  |
Subsequent Event | Oasis Power Holdings | Convertible Debt [Member] | Oasis Power Holdings Convertible Debt |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Acquisition liabilities incurred | $ 5.0 |  |  |  |

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