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Property and Business Interruption Insurance Claims and Recoveries - Additional Information (Detail) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
El Dorado Facility [Member]
Jun. 30, 2013
El Dorado Facility [Member]
Property insurance [Member]
Dec. 31, 2012
El Dorado Facility [Member]
Property insurance [Member]
Cost of sales [Member]
Jun. 30, 2013
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Jun. 30, 2013
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Mar. 31, 2013
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Jun. 30, 2013
El Dorado Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Jun. 30, 2013
Cherokee Facility [Member]
Jun. 30, 2013
Cherokee Facility [Member]
Property insurance [Member]
Mar. 31, 2013
Cherokee Facility [Member]
Business Interruption Insurance [Member]
Jun. 30, 2013
Cherokee Facility [Member]
Business Interruption Insurance [Member]
Jun. 30, 2013
Cherokee Facility [Member]
Business Interruption Insurance [Member]
Cost of sales [Member]
Jun. 30, 2013
Cherokee 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    
Insurance payments received with reservation of rights     30,000,000                   15,000,000    
Approved insurance payments     50,000,000 37,500,000   12,500,000                  
Insurance claim recoverable costs       22,800,000 7,300,000   500,000 700,000 8,500,000     10,100,000   2,900,000 13,000,000
Deferred gain on insurance recovery 20,707,000     14,700,000   4,000,000             2,000,000    
Insurance claim receivable $ 1,907,000 $ 10,059,000               $ 1,900,000