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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Jan. 31, 2017	Sep. 30, 2016	Aug. 01, 2016
Debt Instrument [Line Items]
Long-term debt	$ 417,272,000	$ 420,220,000
Zena Energy L.L.C [Member] \| Secured Promissory Note Due [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 01, 2017
Debt instrument, frequency of interest payment	monthly
Debt instrument basis spread on variable rate	3.00%
EL Dorado Chemical Company [Member] \| Senior Secured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 29, 2019
Debt instrument, frequency of interest payment	monthly
Final balloon payment	$ 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
Letters of credit maximum capacity			$ 10,000,000
Amount available for borrowing	$ 44,900,000
Maturity date	Jan. 17, 2022
Springing maturity date	90 days
4.5% Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate	4.50%	4.50%
Long-term debt		$ 0
Senior Secured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Maturity year	2019	2019
4.05% Secured Promissory Note Due 2017 [Member]
Debt Instrument [Line Items]
Maturity year	2017	2017
Long-term debt, effective Interest Rate	4.05%	4.05%
Long-term debt	$ 4,723,000	$ 6,566,000
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%
Long-term debt	$ 8,917,000	$ 9,167,000
5.04% Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Maturity year	2023	2023
Long-term debt, effective Interest Rate	5.04%	5.04%
Maturity date	May 31, 2023
Long-term debt	$ 18,150,000	$ 18,645,000
Debt instrument, frequency of interest payment	monthly
Final balloon payment	$ 6,100,000
5.04% Secured Promissory Note Due 2023 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument term	interest at a rate that is based on the monthly LIBOR rate plus a base rate
Other [Member]
Debt Instrument [Line Items]
Weighted-average interest rate of other debt	4.55%	4.55%
Long-term debt	$ 3,833,000	$ 4,185,000
Springing Financials Covenant [Member] \| Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Working capital revolver loan requirements	Borrowers must maintain (a) with respect to relevant periods ending on or prior to September 30, 2017, a minimum EBITDA in the amount set forth in the Working Capital Revolver Loan Amendment and (b) with respect to relevant periods ending after September 30, 2017, 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%
Springing Financials Covenant [Member] \| Working Capital Revolver Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term debt	$ 5,000,000
Senior Secured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Maturity date	Aug. 01, 2019
Long-term debt	$ 375,000,000	$ 375,000,000
Debt instrument, frequency of interest payment	Interest is to be paid semiannually on February 1st and August 1st.
Debt instrument, interest rate				7.75%	8.50%
5.25% Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Maturity year	2021	2021
Long-term debt, effective Interest Rate	5.25%	5.25%
Maturity date	Mar. 26, 2021
Long-term debt	$ 13,532,000	$ 14,272,000
Secured promissory note, payment term	Principal and interest are payable in monthly installments.