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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 09, 2015 USD ($) | Dec. 31, 2015 USD ($) Guarantor | Dec. 31, 2014 | Dec. 31, 2013 USD ($) | Nov. 09, 2015 USD ($) | Aug. 07, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Amended working capital revolver loan requirements |  | Fixed Charge Coverage Ratio (as defined by the Amended Working Capital Revolver Loan) is greater than 2.0 to 1.0 |  |  |  |
Fixed Charge Coverage Ratio |  | 2.0 |  |  |  |
Earliest redemption date |  | Aug. 01, 2016 |  |  |  |
Loss on extinguishment of debt |  |  |  | $ (1,296,000) |  |
Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notice period of senior secured notes to be redeemed |  | Not less than 30 days |  |  |  |
Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notice period of senior secured notes to be redeemed |  | Nor more than 60 days |  |  |  |
Amended Working Capital Revolver Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, interest rate |  | 4.00% |  |  |  |
Amended maximum amount of revolving credit facility |  | $ 100,000,000 |  |  |  |
Limit of consolidated leverage ratio |  | 250.00% |  |  |  |
Limit of consolidated net earnings |  | 50.00% |  |  |  |
Amended working capital revolver loan requirements |  | A minimum fixed charge coverage ratio of not less than 1.10 to 1, if at any time the excess availability (as defined by the Amended Working Capital Revolver Loan), under the Amended Working Capital Revolver Loan, is less than or equal to $12.5 million. |  |  |  |
Maturity date |  | Apr. 13, 2018 |  |  |  |
Description of interest rate of revolving credit facility |  | Interest at a base rate (generally equivalent to the prime rate) plus 0.50% if borrowing availability is greater than $25.0 million, otherwise plus 0.75% or, at our option, accrues interest at LIBOR plus 1.50% if borrowing availability is greater than $25.0 million, otherwise LIBOR plus 1.75%. |  |  |  |
Letters of credit maximum capacity |  | $ 15,000,000 |  |  |  |
Amount available for borrowing |  | $ 64,400,000 |  |  |  |
Fees expressed as percentage for unused letters of credit |  | 1.00% |  |  |  |
Fees expressed as percentage for unused revolving credit facility |  | 0.25% |  |  |  |
Fixed charge coverage ratio |  | 110.00% |  |  |  |
Line of credit |  | $ 12,500,000 |  |  |  |
Amended Working Capital Revolver Loan [Member] | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | 25,000,000 |  |  |  |
Amended Working Capital Revolver Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | $ 25,000,000 |  |  |  |
Amended Working Capital Revolver Loan [Member] | Minimum [Member] | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument basis spread on variable rate |  | 0.50% |  |  |  |
Amended 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% |  |  |  |
Amended Working Capital Revolver Loan [Member] | Maximum [Member] | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument basis spread on variable rate |  | 0.75% |  |  |  |
Amended 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% |  |  |  |
Amended Working Capital Revolver Loan [Member] | Zena Energy L.L.C [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Limit of investment in subsidiary |  | $ 50,000,000 |  |  |  |
Second Amendment [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Increased permitted purchase money indebtedness |  | $ 35,000,000 |  |  |  |
Percentage of total consolidated assets |  | 5.50% |  |  |  |
Excess availability under credit facility |  | $ 30,000,000 |  |  |  |
12.0% Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 12.00% | 12.00% |  | 12.00% |
Maturity year |  | 2019 | 2019 |  |  |
Maturity date |  | Aug. 01, 2019 |  |  |  |
Offering date |  | Nov. 09, 2015 |  |  |  |
Aggregate principal amount of notes sold |  |  |  |  | $ 50,000,000 |
Debt instrument, frequency of interest payment |  | Interest is to be paid semiannually on February 1st and August 1st, beginning February 1, 2016. |  |  |  |
Payment beginning date |  | Feb. 01, 2016 |  |  |  |
Senior Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Change in control purchase price |  | 101.00% |  |  |  |
Senior Secured Notes [Member] | Registration Rights Agreement-Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Agreement closing date |  | Nov. 09, 2015 |  |  |  |
Increase in annual interest rate for the first 90 days after default |  | 0.25% |  |  |  |
Amount of per day increase in interest for the first 90 days after default |  | $ 350 |  |  |  |
Additional increase in annual interest rate for each subsequent ninety day period after default |  | 0.25% |  |  |  |
Period to have registration statement declared effective |  | 180 days |  |  |  |
Period to complete notes exchange from effective date |  | 365 days |  |  |  |
Maximum interest rate increase for default |  | 1.00% |  |  |  |
Maximum daily penalty amount for default |  | $ 1,400 |  |  |  |
Secured Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of outstanding borrowings |  | 67,200,000 |  |  |  |
Loss on extinguishment of debt |  | $ 1,300,000 |  |  |  |
Working Capital Revolver Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, interest rate |  | 4.00% | 4.00% |  |  |
7.75% Senior Secured Notes Due 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 7.75% | 7.75% |  |  | 7.75%
Maturity year |  | 2019 | 2019 |  |  |
Maturity date |  | Aug. 01, 2019 |  |  |  |
Offering date |  | Aug. 07, 2013 |  |  |  |
Aggregate principal amount of notes sold |  |  |  |  |  | $ 425,000,000
Debt instrument, frequency of interest payment |  | Interest is to be paid semiannually on February 1st and August 1st. |  |  |  |
Number of unsecured guarantors | Guarantor |  | 1 |  |  |  |
Number of secured guarantors | Guarantor |  | 1 |  |  |  |
Secured Promissory Note Due 2016 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity year |  | 2016 | 2016 |  |  |
Long-term debt, effective Interest Rate |  | 3.42% | 3.42% |  |  |
Secured Promissory Note Due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 5.25% |  |  |  |  |
Maturity year | 2021 | 2021 | 2021 |  |  |
Long-term debt, effective Interest Rate |  | 5.25% | 5.25% |  |  |
Maturity date |  | Mar. 26, 2021 |  |  |  |
Proceeds of the secured promissory note | $ 16,200,000 |  |  |  |  |
Secured promissory note, payment term |  | Interest only is payable monthly for the first 12 months of the term. Principal and interest are payable monthly for the remaining term of the Secured Promissory Note due 2021. |  |  |  |
Secured Promissory Note Due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity year |  | 2022 | 2022 |  |  |
Long-term debt, effective Interest Rate |  | 4.24% | 4.24% |  |  |
Maturity date |  | May 31, 2022 |  |  |  |
Secured Promissory Note Due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 4.00% |  |  |  |
Secured Promissory Note Due 2022 [Member] | EL Dorado Ammonia L.L.C [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds of the secured promissory note |  | $ 15,000,000 |  |  |  |
Secured Promissory Note Due 2022 [Member] | EL Dorado Ammonia L.L.C [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount of notes sold |  | $ 19,800,000 |  |  |  |
Other [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate of other debt |  | 4.34% | 4.34% |  |  |
Covenants [Member] | Amended Working Capital Revolver Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan requirements description |  | at least 20% of the maximum revolver commitment or $20 million, whichever is greater, is available. |  |  |  |
Maximum revolver commitment available, percentage |  | 20.00% |  |  |  |
Maximum revolver commitment available, amount |  | $ 20,000,000 |  |  |  |
Limit of distributions/dividends |  | 500,000 |  |  |  |
Limit of treasury stock acquisition |  | 500,000 |  |  |  |
Limit of joint ventures |  | 35,000,000 |  |  |  |
Limit of Other Investments |  | $ 50,000,000 |  |  |  |
Events of default description |  | Any material misstatement or misrepresentation and breaches of representations and warranties made, violations of covenants, cross-payment default to indebtedness in excess of $2.5 million, cross-acceleration to indebtedness in excess of $2.5 million, bankruptcy and insolvency events, certain unsatisfied judgments, certain liens, and certain assertions of, or actual invalidity of, certain loan documents. |  |  |  |
Debt default amount |  | $ 2,500,000 |  |  |  |
First Priority Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Carrying value of the assets |  | 1,000,000,000 |  |  |  |
Second Priority Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Carrying value of the assets |  | $ 139,400,000 |  |  |  |

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