Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	$ 58,974
Balance at end of period	57,070
Foreign currency translation
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	(1,568)	$ (471)
Total other comprehensive (loss) income	429	(161)
Balance at end of period	(1,139)	(632)
Available-for-sale marketable securities
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at beginning of period	12	23
Other comprehensive (loss) income	(3)	0
Deferred income taxes	0	0
Total other comprehensive (loss) income	(3)	0
Balance at end of period	9	23
Total accumulated other comprehensive loss
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Balance at end of period	$ (1,130)	$ (609)