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Property and Business Interruption Insurance Claims and Recoveries - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2013
El Dorado Facility [Member]
Nov. 30, 2013
El Dorado Facility [Member]
Dec. 31, 2013
El Dorado Facility [Member]
Property Insurance [Member]
Dec. 31, 2013
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Dec. 31, 2013
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Dec. 31, 2012
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Dec. 31, 2013
Cherokee Facility [Member]
Dec. 31, 2013
Cherokee Facility [Member]
Property Insurance [Member]
Dec. 31, 2013
Cherokee Facility [Member]
Business Interruption Insurance [Member]
Dec. 31, 2013
Cherokee Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Dec. 31, 2011
Pryor Facility [Member]
Business Interruption Insurance [Member]
Dec. 31, 2011
Pryor Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Property And Or Business Interruption Insurance Claims [Line Items]                            
Deductible property damage under insurance         $ 1,000,000         $ 2,500,000        
Waiting period for business interruption coverage           30 days         30 days   30 days  
Approved insurance payments     113,000,000   90,700,000 22,300,000 15,000,000 7,300,000            
Approved insurance payments received       53,000,000                    
Approved insurance payments received prior to conclusion     60,000,000                      
Insurance claim recoverable costs         24,700,000             13,600,000    
Property insurance recoveries in excess of losses incurred 66,255,000       66,000,000                  
Insurance payments received with reservation of rights                     15,000,000      
Deferred gain on insurance recovery                     1,400,000      
Insurance claim receivable 1,865,000 10,059,000             1,900,000          
Gain on business interruption insurance recovery                           $ 8,600,000