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Long-Term Debt - Working Capital Revolver Loan and Senior Secured Notes - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 21, 2019 | Apr. 25, 2018 | Feb. 28, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense, net |  | $ 900,000 |  | $ 80,000 | $ 80,000 | $ 79,000 | $ 1,327,000 | $ 51,115,000 | $ 46,389,000 | $ 43,064,000
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ 5,951,000
Working Capital Revolver Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount of revolving credit facility |  |  | $ 65,000,000 |  |  |  |  |  |  |
Revolving credit facility, increase (decrease), net |  |  |  |  |  |  |  | 10,000,000 |  |
Amount available for borrowing |  |  |  | $ 41,800,000 |  |  |  | $ 41,800,000 |  |
Maturity date |  |  |  |  |  |  |  | Feb. 26, 2024 |  |
Working Capital Revolver Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  |  | 1.50% |  |  |  |  |  |  |
Working Capital Revolver Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  |  | 1.75% |  |  |  |  |  |  |
Working Capital Revolver Loan [Member] | Wells Fargo Capital Finance, Inc. [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |  |
Working Capital Revolver Loan [Member] | Wells Fargo Capital Finance, Inc. [Member] | Prime Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  |  | 0.75% |  |  |  |  |  |  |
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 on the Senior Secured Notes accrues at a rate of 9.625% per annum and is payable semi-annually in arrears on May 1 and November 1 of each year. |  |
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 |  | $ 6,000,000.0 |  |  |  |  |  |  |  |
Senior Secured Notes [Member] | Optional Redemption prior to May 1, 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  | 3.609% |  |
Senior Secured Notes [Member] | Change of Control [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  | 101.00% |  |
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. |  |
Paycheck Protection Program [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Federally guaranteed loan agreement (“PPP loan”) |  |  |  | $ 10,000,000 |  |  |  | $ 10,000,000 |  |
Federally guaranteed loan agreement (“PPP loan”), disbursement description |  |  |  |  |  |  |  | Under the current terms of the PPP loan, loan forgiveness applications are due within 10 months after the end of the loan forgiveness covered period, which period began on the date the PPP loan was disbursed and ends either 8-weeks or 24-weeks after disbursement of the loan. |  |
Federally guaranteed loan agreement (“PPP loan”), maturity period |  |  |  |  |  |  |  | 2022-04 |  |
Federally guaranteed loan agreement (“PPP loan”), loan maturity period description |  |  |  |  |  |  |  | Currently, the loan matures in April 2022, which term may be extended to April 2025 if mutually agreed to by the parties. |  |
8.32% Secured Financing Due 2023 [Member] | EL Dorado Chemical Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  | Jun. 30, 2023 |
Debt instrument, frequency of interest payment |  |  |  |  |  |  |  |  | Principal and interest are payable in 48 equal monthly installments with a final balloon payment of approximately $3 million due in June 2023. |
Final balloon payment |  |  |  |  |  |  |  |  | $ 3,000,000 |
Secured Loan Agreement | EL Dorado Chemical Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, frequency of interest payment |  |  |  |  |  |  |  |  | principal and interest will be payable in 60 equal monthly installments. |
8.75% Secured Financing Due 2025 [Member] | El Dorado Ammonia L.L.C. [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | Aug. 31, 2025 |  |
Debt issued - principal amount |  |  |  | 30,000,000 |  |  |  | $ 30,000,000 |  |
Debt instrument, frequency of interest payment |  |  |  |  |  |  |  | principal and interest are payable in 60 equal monthly installments with a final balloon payment of approximately $5 million due in August 2025. |  |
Final balloon payment |  |  |  | $ 5,000,000 |  |  |  | $ 5,000,000 |  |
Secured Promissory Note Due 2023 [Member] | El Dorado Ammonia L.L.C. [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | May 31, 2023 |  |
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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