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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

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