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Summary of Company's debt (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Total debt | $ 87,434 | $ 56,952
Current portion | (22,164) | (17,218)
Long-term debt, less current maturities | 65,270 | 39,734
US Term Note |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Total debt | 25,813 | 29,312
Europe Term Note |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Total debt | 40,507 | 4,476
W.E.T. Term Note |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.00% |
Total debt | 12,897 | 18,852
German Investment Corporation |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.25% |
Total debt | 5,403 |
Capital Lease Obligations |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.20% |
Total debt | 2,814 | 1,140
Bank of China |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 3,172

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