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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) Guarantors | Dec. 31, 2014
7.75% Senior Secured Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 7.75% |
Maturity date | Aug. 01, 2019 |
Debt instrument, frequency of interest payment | Interest is to be paid semiannually on February 1st and August 1st |
Number of unsecured guarantors | Guarantors | 2 |
Secured Promissory Note Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 5.25% |
Maturity date | Mar. 26, 2021 |
Proceeds of the Secured Promissory Note | $ 16,200,000 |
Secured promissory note, payment term | Interest only is payable monthly for the first 12 months of the term. Principal and interest are payable monthly for the remaining term of the note. |
Amended Working Capital Revolver Loan [Member] |  |
Debt Instrument [Line Items] |  |
Limit of consolidated leverage ratio | 250.00% |
Limit of cumulative consolidated net income or loss | 50.00% |
Limit of joint ventures | $ 35,000,000 |
Amended working capital revolver loan requirements | Fixed Charge Coverage Ratio, as defined in the amendment, is greater than 2.0 to 1.0. |
Maximum amount of revolving credit facility | $ 100,000,000 |
Letters of credit maximum capacity | $ 15,000,000 |
Maturity date | Apr. 13, 2018 |
Amended Working Capital Revolver Loan [Member] | Zena Energy LLC [Member] |  |
Debt Instrument [Line Items] |  |
Limit of investment in subsidiary | $ 50,000,000 |
7.75% Senior Secured Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 7.75% | 7.75%
Maturity year | 2019 | 2019
Secured Promissory Note Due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Maturity year | 2016 | 2016
Secured Promissory Note, interest rate | 3.28% | 3.28%
Secured Promissory Note Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Maturity year | 2021 | 2021
Secured Promissory Note, interest rate | 5.25% | 5.25%
Other [Member] |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate of other debt | 4.33% | 4.33%
Covenants [Member] | Amended Working Capital Revolver Loan [Member] |  |
Debt Instrument [Line Items] |  |
Loan requirements description | At least 20% of the maximum revolver commitment or $20 million, whichever is greater, being available. |

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