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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