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Debt (Details) - USD ($) |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 08, 2015 | Jul. 31, 2013 | Dec. 17, 2012 | Sep. 30, 2015 | Sep. 30, 2014 | Aug. 01, 2014 | Dec. 31, 2013 | Jan. 24, 2011 | May. 30, 2008
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  | $ 20,700,000 |  |  |  |  |  |
Proceeds from line of credit |  |  |  | $ 52,225,000 | [1] | $ 60,280,000 |  |  |  |
Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Extension past maturity term | 1 year |  |  |  |  |  |  |  |  |
Minimum adjusted tangible net worth, greater than | $ 18,000,000.0 |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio | 110.00% |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio, quarterly increase to numerator | 5.00% |  |  |  |  |  |  |  |  |
Maximum total leverage ratio | 250.00% |  |  |  |  |  |  |  |  |
Change in control ownership percentage maximum | 40.00% |  |  |  |  |  |  |  |  |
Material judgements | $ 5,000,000 |  |  |  |  |  |  |  |  |
NuDevco Retail Holdings | Spark HoldCo | Notes Payable |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Note payable |  |  |  |  |  |  | $ 50,000 |  |  |
Working Capital Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 80,000,000 | $ 70,000,000 |  |  |  |  |  | $ 150,000,000 | $ 177,500,000.0
Working capital facility outstanding |  |  |  |  |  |  |  | $ 27,500,000 |  |
Working capital credit facility outstanding portion paid by affiliate |  |  |  |  |  |  | 29,000,000 |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  | 15,000,000 |  |  |
Nonutilization fee |  |  | 0.50% |  |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.50% |  |  |  |  |  |
Working Capital Facility | Eurodollar | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% | 3.00% |  |  |  |  |  |  |
Working Capital Facility | Eurodollar | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.25% | 3.75% |  |  |  |  |  |  |
Working Capital Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% | 2.00% |  |  |  |  |  |  |
Working Capital Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.25% | 2.75% |  |  |  |  |  |  |
Working Capital Facility | Cost of Funds Rate | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.50% |  |  |  |  |  |  |  |
Working Capital Facility | Cost of Funds Rate | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 125,000,000 |  |  |  |  |  | $ 130,000,000 | 100,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 30,000,000 |  |  |  |  |  |  | $ 35,000,000
Revolving Credit Facility | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term portion of Senior Credit Facility |  |  |  |  |  |  | 10,000,000 |  |  |
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | 70,000,000.0 |  |  |
Contingent maximum borrowing capacity |  |  |  |  |  |  | $ 120,000,000.0 |  |  |
Revolving Credit Facility | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 60,000,000.0 |  |  |  |  |  |  |  |  |
Nonutilization fee | 0.50% |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |  |  |  |  |  |
Reduction to interest rate if facility utilization is less than fifty percent | 25.00% |  |  |  |  |  |  |  |  |
Minimum net working capital, initial working capital requirement | $ 2,000,000.0 |  |  |  |  |  |  |  |  |
Minimum net working capital, gradual increase requirement | $ 5,000,000.0 |  |  |  |  |  |  |  |  |
Minimum net working capital, elected availability under the Working Capital Line percentage | 15.00% |  |  |  |  |  |  |  |  |
Minimum adjusted tangible net worth, aggregate commitments under Working Capital Line percentage | 20.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 25,000,000.0 |  |  |  |  |  |  |  |  |
Nonutilization fee | 0.50% |  |  |  |  |  |  |  |  |
Financing of acquisition transaction maximum percentage | 75.00% |  |  |  |  |  |  |  |  |
Annual payment percentage | 25.00% |  |  |  |  |  |  |  |  |
Payment at maturity percentage | 50.00% |  |  |  |  |  |  |  |  |
Minimum adjusted tangible net worth, borrowings under the Acquisition Line percentage | 33.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 30,000,000.0 |  |  |  |  |  |  |  |  |
Borrowing base percentage | 80.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 60,000,000.0 |  |  |  |  |  |  |  |  |
Borrowing base percentage | 90.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Eurodollar | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.00% |  |  |  |  |  |
Revolving Credit Facility | Eurodollar | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.75% |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.00% |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.75% |  |  |  |  |  |
Revolving Credit Facility | Cost of Funds Rate | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.50% |  |  |  |  |  |
Revolving Credit Facility | Federal Funds Effective Swap Rate | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |
Revolving Credit Facility | Federal Funds Effective Swap Rate | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |
Revolving Credit Facility | Reference Eurodollar | Working Capital Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.00% |  |  |  |  |  |
Revolving Credit Facility | Reference Eurodollar | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.00% |  |  |  |  |  |
Revolving Credit Facility | CenStar | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from line of credit | $ 16,600,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Oasis Power Holdings | Acquisition Line |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from line of credit | $ 15,000,000 |  |  |  |  |  |  |  |  |
Letters Of Credit Outstanding More Than Two Business Days | Base Rate |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.00% |  |  |  |  |  |
[1] | Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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