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Subsequent Events - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
SAIC Constructors [Member]
Jun. 30, 2013
Ammonia plant [Member]
El Dorado Facility [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Guarantors
Jun. 30, 2013
Senior Secured Notes [Member]
Minimum [Member]
Jun. 30, 2013
Senior Secured Notes [Member]
Maximum [Member]
Jun. 30, 2013
Secured Term Loan [Member]
Jun. 30, 2013
Amended Working Capital Revolver [Member]
D
Jun. 30, 2013
Amended Working Capital Revolver [Member]
Covenants [Member]
Jun. 30, 2013
Amended Working Capital Revolver [Member]
Covenants [Member]
Default Events [Member]
Aug. 07, 2013
Amended Working Capital Revolver [Member]
Subsequent Events [Member]
Jun. 30, 2013
Amended Working Capital Revolver [Member]
Loans [Member]
Covenants [Member]
Subsequent Event [Line Items]                          
Offering date         Aug. 07, 2013                
Aggregate principal amount of notes sold         $ 425,000,000                
Net proceeds received from private placement of notes         418,000,000                
Debt instrument, interest rate         7.75%                
Maturity date         Aug. 01, 2019       Apr. 13, 2018        
Debt instrument, start date of interest payment         Feb. 01, 2014                
Number of unsecured guarantors         2                
Notice period of senior secured notes to be redeemed           Not less than 30 days Nor more than 60 days            
Earliest redemption date         Aug. 01, 2016                
Change in control purchase price         101.00%                
Repayment of outstanding borrowings 107,865,000 72,441,000           67,200,000          
Period to complete notes exchange from offering closing date         180 days                
Period to file a registration statement from offering closing date         365 days                
Interest rate increase for default         0.25%                
Default duration for increased interest rate         90 days                
Maximum interest rate increase for default         1.00%                
Amendment date                 Jul. 31, 2013        
Original maximum amount of revolving credit facility                 50,000,000        
Amended maximum amount of revolving credit facility                 100,000,000        
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%.        
Line of credit facility, interest rate                       3.75%  
Letters of credit maximum capacity                 15,000,000        
Fees expressed as percentage for unused letters of credit                 1.00%        
Fees expressed as percentage for unused revolving credit facility                 0.25%        
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.        
Number of business days prior to distribution to make payment                 5        
Maximum annual fee paid under management agreement                   7,500,000      
Maximum amount of net income distributable to parent                   50.00%      
Loan requirements description                         Equal to or greater than the greater of (x) 20% of the maximum revolver commitment or (y) $20 million
Maximum amount of loans to or other investments in Parent                         5,000,000
Limit of distributions/dividends                         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 $0.1 million, cross-acceleration to indebtedness in excess of $0.1 million, bankruptcy and insolvency events, certain unsatisfied judgments, certain liens, and certain assertions of, or actual invalidity of, certain loan documents.    
Minimum range of estimated capital cost to construct plant       250,000,000                  
Maximum range of estimated capital cost to construct plant       300,000,000                  
Project costs capitalized       16,400,000                  
Estimated construction agreement fees     $ 22,000,000