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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 16, 2015 USD ($) | Sep. 30, 2015 USD ($) Guarantors | Dec. 31, 2014
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. |
Fixed Charge Coverage Ratio |  | 2.0 |
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 L.L.C [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Limit of investment in subsidiary |  | $ 50,000,000 |
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. |
Maximum revolver commitment available, percentage |  | 20.00% |
Maximum revolver commitment available, amount |  | $ 20,000,000 |
Working Capital Revolver Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, effective Interest Rate |  | 3.75% | 3.75%
7.75% Senior Secured Notes Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate |  | 7.75% | 7.75%
Maturity year |  | 2019 | 2019
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 |  | 1 |
Secured Promissory Note Due 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, effective Interest Rate |  | 3.33% | 3.33%
Maturity year |  | 2016 | 2016
Secured Promissory Note Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, effective Interest Rate |  | 5.25% | 5.25%
Debt instrument, interest rate |  | 5.25% |
Maturity year |  | 2021 | 2021
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 Secured Promissory Note due 2021. |
Secured Promissory Note Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, effective Interest Rate |  | 4.21% | 4.21%
Maturity year |  | 2022 | 2022
Maturity date |  | May 31, 2022 |
Secured Promissory Note Due 2022 [Member] | EL Dorado Ammonia L.L.C [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds of the Secured Promissory Note | $ 15,000,000 |  |
Secured Promissory Note Due 2022 [Member] | EL Dorado Ammonia L.L.C [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum principal note amount | $ 19,800,000 |  |
Other [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate of other debt |  | 4.50% | 4.50%

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