Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	$ 56,606	$ 34,194	$ 17,089	$ 19,362
Cash held internationally, principally in Netherlands, China, Great Britain, and Canada	26,800	18,000
Credit Agreement [Member]
Fair Value Of Financial Instruments [Line Items]
Fair value of debt issued	$ 150,600	$ 174,800