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Financial Assets and Liabilities Accounted For at Fair Value on Recurring Basis (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ 390,047 $ 425,151
Convertible senior notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 129,677 126,918
Term loan credit agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 249,365 290,812
Industrial revenue bond
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 2,235 2,500
Capital lease obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 8,770 4,921
Fair Value, Inputs, Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 1 | Convertible senior notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 1 | Term loan credit agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 1 | Industrial revenue bond
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 1 | Capital lease obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 451,289 466,291
Fair Value, Inputs, Level 2 | Convertible senior notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 196,313 165,563
Fair Value, Inputs, Level 2 | Term loan credit agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 254,976 300,728
Fair Value, Inputs, Level 2 | Industrial revenue bond
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 2 | Capital lease obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 11,005 7,421
Fair Value, Inputs, Level 3 | Convertible senior notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 3 | Term loan credit agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 0 0
Fair Value, Inputs, Level 3 | Industrial revenue bond
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring 2,235 2,500
Fair Value, Inputs, Level 3 | Capital lease obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities, fair value disclosure, recurring $ 8,770 $ 4,921