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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 07, 2016 USD ($) | May 13, 2016 USD ($) Installment | Apr. 02, 2016 Installment | Feb. 05, 2016 USD ($) Installment | Sep. 16, 2015 USD ($) | Sep. 30, 2016 USD ($) $ / Unit | Sep. 30, 2016 USD ($) $ / Unit | Dec. 31, 2015 USD ($) | Aug. 01, 2016 | Aug. 07, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 519,585,000 | $ 519,585,000 | $ 520,422,000 |  |
Less current portion of long-term debt, net |  |  |  |  |  | $ 110,495,000 | $ 110,495,000 | $ 22,468,000 |  |
Proceeds of the secured promissory note |  | $ 4,800,000 |  |  | $ 15,000,000 |  |  |  |  |
12% Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  | 12.00% | 12.00% | 12.00% |  |
Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 7.75%
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  | $ 425,000,000
Redeemable principal amount | $ 50,000,000 |  |  |  |  |  |  |  |  |
Redemption price | 103.875% |  |  |  |  |  |  |  |  |
Amended Note [Member] | Zena Energy L.L.C [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 01, 2017 |  |  |  |  |  |  |
Debt instrument, number of periodic payment | Installment |  |  | 20 |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  |  | 3.00% |  |  |  |  |  |  |
Secured Promissory Note Due [Member] | Zena Energy L.L.C [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, frequency of payment |  |  |  |  |  |  | Monthly |  |  |
4% Working Capital Revolver Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate |  |  |  |  |  | 4.00% | 4.00% | 4.00% |  |
Maturity date |  |  |  |  |  |  | Apr. 13, 2018 |  |  |
Maximum amount of revolving credit facility |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 |  |  |
Letters of credit maximum capacity |  |  |  |  |  | 15,000,000 | 15,000,000 |  |  |
Amount available for borrowing |  |  |  |  |  | $ 22,600,000 | $ 22,600,000 |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 0 |  |
3.84% Secured Promissory Note Due 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity year |  |  |  |  |  |  | 2017 | 2017 |  |
Long-term debt, effective Interest Rate |  |  |  |  |  | 3.84% | 3.84% | 3.84% |  |
Long-term debt |  |  |  |  |  | $ 8,392,000 | $ 8,392,000 | $ 15,856,000 |  |
5.73% Secured Promissory Note Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity year |  |  |  |  |  |  | 2019 | 2019 |  |
Long-term debt, effective Interest Rate |  |  |  |  |  | 5.73% | 5.73% | 5.73% |  |
Long-term debt |  |  |  |  |  | $ 9,417,000 | $ 9,417,000 |  |  |
5.25% Secured Promissory Note due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, effective Interest Rate |  |  |  |  |  | 5.25% | 5.25% | 5.25% |  |
Maturity date |  |  |  |  |  |  | Mar. 26, 2021 |  |  |
Long-term debt |  |  |  |  |  | $ 15,000,000 | $ 15,000,000 | $ 16,189,000 |  |
Secured promissory note, payment term |  |  |  |  |  |  | This note required interest only monthly payments for the first 12 months of the term (through April 2016) and then principal and interest monthly payments through the remaining term |  |  |
4.77% Secured Promissory Note Due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, effective Interest Rate |  |  |  |  |  | 4.77% | 4.77% | 4.77% |  |
Long-term debt |  |  |  |  |  | $ 19,140,000 | $ 19,140,000 | $ 15,000,000 |  |
Other [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate of other debt |  |  |  |  |  | 4.60% | 4.60% | 4.60% |  |
Long-term debt |  |  |  |  |  | $ 4,799,000 | $ 4,799,000 | $ 7,103,000 |  |
12% Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 12.00% |  |  |  |  | 12.00% | 12.00% |  |  |
Redeemable principal amount | $ 50,000,000 |  |  |  |  |  |  |  |  |
Redemption price | 106.00% |  |  |  |  |  |  |  |  |
12% Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  | 8.50% |
The maximum amount of future pari passu indebtedness |  |  |  |  |  | $ 25,000,000 | $ 25,000,000 |  |  |
Long-term debt |  |  |  |  |  | 50,000,000 | 50,000,000 |  |  |
Senior secured notes outstanding value |  |  |  |  |  | 375,000,000 | 375,000,000 |  |  |
Interest expense recognized |  |  |  |  |  | 500,000 |  |  |  |
Less current portion of long-term debt, net |  |  |  |  |  | 96,200,000 | 96,200,000 |  |  |
Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 425,000,000 | 425,000,000 | $ 425,000,000 |  |
Cash payment for debt holder consent |  |  |  |  |  |  | $ 5,400,000 |  |  |
Cash price per $1,000 principal amount of notes for consent | $ / Unit |  |  |  |  |  | 13.25 | 13.25 |  |  |
Other fees incurred |  |  |  |  |  | $ 1,400,000 | $ 1,400,000 |  |  |
Secured Promissory Note due 2019 [Member] | EL Dorado Chemical Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | Jun. 29, 2019 |  |  |  |  |  |
Debt instrument, number of periodic payment | Installment |  |  |  | 40 |  |  |  |  |  |
Proceeds of the secured promissory note |  |  |  | $ 10,000,000 |  |  |  |  |  |
Final balloon payment |  |  |  | $ 6,700,000 |  |  |  |  |  |
Secured Promissory Note Due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, number of periodic payment | Installment |  | 83 |  |  |  |  |  |  |  |
Final balloon payment |  | $ 6,100,000 |  |  |  |  |  |  |  |
Loan term after conversion |  | 7 years |  |  |  |  |  |  |  |
Secured Promissory Note Due 2023 [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 4.25% |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | May 31, 2023 |  |  |
Debt instrument term |  |  |  |  |  |  | interest at a rate that is based on the monthly LIBOR rate plus 4.25% and matures in May 2023 |  |  |
Secured Promissory Note Due 2023 [Member] | EL Dorado Ammonia L.L.C [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  | $ 19,800,000 |  |  |  |  |

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