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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Cash and cash equivalents | $ 41,814 | $ 34,194 | $ 30,763 | $ 18,162
Cash held internationally, principally in Netherlands, China, Great Britain, and Canada | 22,000 | 18,000 |  |
Credit Agreement [Member] |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Fair value of debt issued | $ 135,200 | $ 174,800 |  |

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