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Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt [Line Items]
Total debt	$ 186,663	$ 173,387
Current portion of long-term debt	186,663	2,328
Long-term debt		171,059
Convertible Senior Notes
Debt [Line Items]
Total debt	185,708	169,896
Japan Loan
Debt [Line Items]
Total debt	$ 955	$ 3,491

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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