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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
--- | --- | --- | --- | ---
Apr. 25, 2018 | Jan. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 425,199,000 |  |  |  |  |  |  |  | $ 425,199,000 |  |
Debt issuance costs | $ 15,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net | 900,000 |  | 11,056,000 | $ 11,009,000 | $ 11,693,000 | $ 9,306,000 | $ 9,326,000 | $ 9,291,000 | $ 9,292,000 | $ 9,358,000 | 43,064,000 | $ 37,267,000 | $ 30,945,000
Loss on extinguishment of debt |  |  |  | $ 5,951,000 |  |  |  |  |  |  | $ 5,951,000 |  | $ 8,703,000
EL Dorado Chemical Company [Member] | 5.73% Secured Promissory Note Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2019 |  |
Debt instrument, frequency of interest payment |  |  |  |  |  |  |  |  |  |  | monthly |  |
Final balloon payment |  |  | 6,700,000 |  |  |  |  |  |  |  | $ 6,700,000 |  |
Working Capital Revolver Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of revolving credit facility |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, additional borrowing capacity |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Amount available for borrowing |  |  | $ 37,200,000 |  |  |  |  |  |  |  | $ 37,200,000 |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | Jan. 17, 2022 |  |
Working Capital Revolver Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
Working Capital Revolver Loan [Member] | Maximum [Member] | Wells Fargo Capital Finance, Inc. [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
Working Capital Revolver Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  | 1.50% |  |  |  |  |  |  |  |  |  |  |
Working Capital Revolver Loan [Member] | Minimum [Member] | Wells Fargo Capital Finance, Inc. [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
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 or equal to the greater of 10.0% of the total revolver commitments and $5 million |  |
Fixed charge coverage ratio |  |  | 1.00% |  |  |  |  |  |  |  | 1.00% |  |
Springing Financials Covenant [Member] | Working Capital Revolver Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 5,000,000 |  |  |  |  |  |  |  | $ 5,000,000 |  |
9.625% Senior Secured Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | May 01, 2023 |  |
Debt issued - principal amount | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 9.625% |  | 9.625% |  |  |  |  |  |  |  | 9.625% |  |
Debt instrument, maturity term | 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued price percentage | 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, which began on November 1, 2018. |  |
8.5% Senior Secured Notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued - principal amount | $ 375,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 8.50% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity term | 2019 |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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. |  |
5.62% 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 |  |
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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