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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail)
6 Months Ended 12 Months Ended
May 13, 2016
USD ($)
Installment
Apr. 02, 2016
Installment
Feb. 05, 2016
USD ($)
Installment
Sep. 16, 2015
USD ($)
Jun. 30, 2016
USD ($)
Guarantor
Dec. 31, 2015
Debt Instrument [Line Items]            
Proceeds of the secured promissory note $ 4,800,000     $ 15,000,000    
12% Senior Secured Notes Due 2019 [Member]            
Debt Instrument [Line Items]            
Debt instrument, interest rate         12.00% 12.00%
Senior Secured Notes Due 2019 [Member]            
Debt Instrument [Line Items]            
Maturity date         Aug. 01, 2019  
Debt instrument, frequency of payment         Interest is to be paid semiannually on February 1st and August 1st.  
Number of unsecured guarantors | Guarantor         1  
Amended Note [Member] | Zena Energy L.L.C [Member]            
Debt Instrument [Line Items]            
Maturity date   Dec. 01, 2017        
Debt instrument, number of periodic payment | Installment   20        
Debt instrument basis spread on variable rate   3.00%        
Secured Promissory Note Due [Member] | Zena Energy L.L.C [Member]            
Debt Instrument [Line Items]            
Debt instrument, frequency of payment         Monthly  
4.00% Working Capital Revolver Loan [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate         4.00% 4.00%
Maturity date         Apr. 13, 2018  
Maximum amount of revolving credit facility         $ 100,000,000  
Letters of credit maximum capacity         $ 15,000,000  
7.75% Senior Secured Notes Due 2019 [Member]            
Debt Instrument [Line Items]            
Debt instrument, interest rate         7.75% 7.75%
3.69% Secured Promissory Note Due 2017 [Member]            
Debt Instrument [Line Items]            
Maturity year         2017 2017
Long-term debt, effective Interest Rate         3.69% 3.69%
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%
5.25% Secured Promissory Note Due 2021 [Member]            
Debt Instrument [Line Items]            
Long-term debt, effective Interest Rate         5.25% 5.25%
Maturity date         Mar. 26, 2021  
Secured promissory note, payment term         This note required interest only monthly payments for the first 12 months of the term (through April 2016) and then principal and interest monthly payments through the remaining term  
4.72% Secured Promissory Note Due 2023 [Member]            
Debt Instrument [Line Items]            
Long-term debt, effective Interest Rate         4.72% 4.72%
Debt instrument, number of periodic payment | Installment 83          
Final balloon payment $ 6,100,000          
Loan term after conversion 7 years          
4.72% Secured Promissory Note Due 2023 [Member] | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt instrument, interest rate 4.25%          
Debt instrument term         interest at a rate that is based on the monthly LIBOR rate plus 4.25%  
4.72% Secured Promissory Note Due 2023 [Member] | EL Dorado Ammonia L.L.C [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Debt instrument, principal amount       $ 19,800,000    
Other [Member]            
Debt Instrument [Line Items]            
Weighted-average interest rate of other debt         4.50% 4.50%
Secured Promissory Note due 2019 [Member] | EL Dorado Chemical Company [Member]            
Debt Instrument [Line Items]            
Maturity date     Jun. 29, 2019      
Debt instrument, number of periodic payment | Installment     40      
Proceeds of the secured promissory note     $ 10,000,000      
Final balloon payment     $ 6,700,000