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Components of Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	$ 365,422	$ 387,042
Less: unamortized discount	(22,063)	(24,907)
Less: current portion	(3,255)	(3,245)
Long-term debt	340,104	358,890
Term loan credit agreement
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	213,538	234,923
Industrial revenue bond
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	1,884	2,119
Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	150,000	150,000
Less: unamortized discount	(17,420)	(19,372)
Less: current portion	0	0
Long-term debt	$ 132,580	$ 130,628

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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- Definition

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.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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