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Long-Term Debt - Working Capital Revolver Loan and Senior Secured Notes - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 21, 2019 | May 28, 2019 | Apr. 25, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 15,200,000 |  |  |  |  |  |  |
Interest expense, net |  |  | 900,000 | $ 12,007,000 | $ 11,009,000 | $ 34,309,000 | $ 32,008,000 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ (5,951,000) |  |  |
Working Capital Revolver Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount of revolving credit facility |  |  |  |  |  |  |  |  | $ 75,000,000 |
Amount available for borrowing |  |  |  | $ 33,800,000 |  | $ 33,800,000 |  |  |  |
Maturity date |  |  |  |  |  | Feb. 26, 2024 |  |  |  |
Springing Financials Covenant [Member] | Working Capital Revolver Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Working capital revolver loan requirements |  |  |  |  |  | Borrowers must maintain a minimum fixed charge coverage ratio of not less than 1.00 to 1.00. |  |  |  |
Maximum revolver commitment available, percentage |  |  |  |  |  | 10.00% |  |  |  |
Loan requirements description |  |  |  |  |  | Less than 10.0% of the total revolver commitments. |  |  |  |
Fixed charge coverage ratio |  |  |  | 100.00% |  | 100.00% |  |  |  |
9.625% Senior Secured Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | May 01, 2023 |  |  |  |
Debt issued - principal amount | $ 35,000,000 |  | $ 400,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate | 9.625% |  | 9.625% | 9.625% |  | 9.625% |  |  |  |
Debt instrument, maturity term | 2023 |  | 2023 |  |  |  |  |  |  |
Debt instrument issued price percentage | 102.125% |  | 99.509% |  |  |  |  |  |  |
Debt instrument, frequency of interest payment |  |  |  |  |  | Interest is to be paid semiannually in arrears on May 1st and November 1st |  |  |  |
Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued - principal amount |  |  | $ 375,000,000 |  |  |  |  |  |  |
Debt instrument, maturity term |  |  | 2019 |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 6,000,000 |  |  |  |  |  |  |
5.25% Secured Promissory Note Due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Mar. 31, 2021 |  |  |  |
Secured promissory note, payment term |  |  |  |  |  | Principal and interest are payable in monthly installments. |  |  |  |
Long-term debt, effective Interest Rate |  |  |  | 5.25% |  | 5.25% |  |  |  | 5.25%
6.35% Secured Promissory Note Due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, frequency of interest payment |  |  |  |  |  | monthly |  |  |  |
Final balloon payment |  |  |  | $ 6,100,000 |  | $ 6,100,000 |  |  |  |
Maturity month and year |  |  |  |  |  | 2023-05 |  |  |  |
Long-term debt, effective Interest Rate |  |  |  | 6.35% |  | 6.35% |  |  |  | 6.35%
8.32% Secured Financing Due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, effective Interest Rate |  |  |  | 8.32% |  | 8.32% |  |  |  | 8.32%
8.32% Secured Financing Due 2023 [Member] | EL Dorado Chemical Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  | Jun. 01, 2023 |  |  |  |  |  |  |  |
Debt issued - principal amount |  | $ 15,000,000 |  |  |  |  |  |  |  |
Debt instrument, frequency of interest payment |  |  |  |  |  | Beginning in June 2019, principal and interest are payable in 48 equal monthly installments with a final balloon payment of approximately $3 million due on June 1, 2023. |  |  |  |
Final balloon payment |  | $ 3,000,000 |  |  |  |  |  |  |  |
Long-term debt, effective Interest Rate |  | 8.32% |  |  |  |  |  |  |  |
Secured Loan Agreement [Member] | EL Dorado Chemical Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued - principal amount |  |  |  |  |  |  |  | $ 1,800,000 |  |
Debt instrument, frequency of interest payment |  |  |  |  |  | Principal and interest will be payable in 60 equal monthly installments under the term loan. |  |  |  |
Secured Loan Agreement [Member] | EL Dorado Chemical Company [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount available for borrowing |  |  |  |  |  |  |  | $ 7,500,000 |  |
Letter of Credit [Member] | Working Capital Revolver Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount of revolving credit facility |  |  |  |  |  |  |  |  | $ 10,000,000 |

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