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Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt [Line Items]
Total debt	$ 173,387	$ 162,529
Current portion of long-term debt	2,328	2,573
Long-term debt	171,059	159,956
Convertible Senior Notes
Debt [Line Items]
Total debt	169,896	156,098
Japan Loan
Debt [Line Items]
Total debt	$ 3,491	$ 6,431

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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