Debt instrument issued price percentage.

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Debt instrument maturity period.

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Debt instrument maturity term.

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Debt instrument maturity year.

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Fixed charge coverage ratio.

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Line of credit facility, additional borrowing capacity.

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The description of requirements under an agreement to be eligible to enter into certain transactions.

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Minimum excess borrowing availability as percentage of maximum revolver commitments.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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