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Financial Assets and Liabilities Accounted For at Fair Value on Recurring Basis (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ 370,633 $ 370,595
Convertible senior notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 131,596 130,628
Term loan credit agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 228,922 229,388
Industrial revenue bond
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 2,002 2,119
Capital lease obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 8,113 8,460
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 444,148 434,402
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 209,625 197,718
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 234,523 236,684
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 10,115 10,579
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 2,002 2,119
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 $ 8,113 $ 8,460