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Components of Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	$ 449,463	$ 450,250
Unamortized discount of liability component	28,895	30,020
Less: current portion	23,460	3,381
Long-term debt	397,108	416,849
Term loan credit agreement
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	297,000	297,750
Less: current portion	2,300
Long-term debt	297,000
Industrial revenue bond
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	2,463	2,500
Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	150,000	150,000
Unamortized discount of liability component	(22,178)	(23,082)
Less: current portion	0	0
Long-term debt	$ 127,822	$ 126,918

X

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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