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Property and Business Interruption Insurance Claims and Recoveries - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Jan. 31, 2013
El Dorado Facility [Member]
Mar. 31, 2013
El Dorado Facility [Member]
Dec. 31, 2012
El Dorado Facility [Member]
Mar. 31, 2013
El Dorado Facility [Member]
Property insurance [Member]
Dec. 31, 2012
El Dorado Facility [Member]
Property insurance [Member]
Dec. 31, 2012
El Dorado Facility [Member]
Property insurance [Member]
Cost of sales [Member]
Mar. 31, 2013
El Dorado Facility [Member]
Business interruption insurance [Member]
Dec. 31, 2012
El Dorado Facility [Member]
Business interruption insurance [Member]
Mar. 31, 2013
El Dorado Facility [Member]
Business interruption insurance [Member]
Cost of sales [Member]
Mar. 31, 2013
El Dorado Facility [Member]
DSN Plant [Member]
Mar. 31, 2013
Cherokee Facility [Member]
Mar. 31, 2013
Cherokee Facility [Member]
Property insurance [Member]
Mar. 31, 2013
Cherokee Facility [Member]
Business interruption insurance [Member]
Mar. 31, 2013
Cherokee Facility [Member]
Business interruption insurance [Member]
Cost of sales [Member]
Mar. 31, 2013
Pryor Facility [Member]
Property And Or Business Interruption Insurance Claims [Line Items]                                  
Deductible property damage under insurance           $ 1,000,000               $ 2,500,000     $ 1,000,000
Waiting period for business interruption coverage                 30 days           30 days   30 days
Repair cost - estimated lower range                       48,000,000          
Repair cost - estimated upper range                       60,000,000          
Approved insurance payments received         20,000,000                        
Approved insurance payments         40,000,000   28,600,000     11,400,000              
Approved insurance payments with reservation of rights     20,000,000                       15,000,000    
Insurance claim recoverable costs       8,000,000     22,400,000 7,300,000     700,000         10,100,000  
Deferred gain on insurance recovery 9,617,000          6,200,000     3,400,000                
Insurance recoveries in excess of recoverable costs, not recognized                             4,900,000    
Insurance claim receivable $ 12,064,000 $ 10,059,000                     $ 12,100,000