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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Fair Value Of Financial Instruments [Line Items]          
Cash and cash equivalents $ 17,089 $ 19,362 $ 17,788   $ 22,661
Cash held internationally, principally in Netherlands, China, Great Britain, and Canada $ 9,500 $ 11,700      
Foreign Exchange Contract [Member]          
Fair Value Of Financial Instruments [Line Items]          
U.S. dollar-denominated transaction total       $ 5,500