Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Foreign currency translation
Balance at beginning of period	$ (142)		$ 449		$ (419)		$ 345
Other comprehensive income:
Foreign currency translation adjustments	162	[1]	(420)	[1]	439	[1]	(316)	[1]
Balance at end of period	20		29		20		29
Available-for-sale marketable securities
Balance at beginning of period	15		25		27		36
Other comprehensive income (loss):
Net unrealized holding gain (loss)	4	[2]	17	[2]	(16)	[2]	0	[2]
Deferred income taxes	(2)	[2]	(6)	[2]	6	[2]	0	[2]
Total other comprehensive income (loss)	2		11		(10)		0
Balance at end of period	17		36		17		36
Total accumulated other comprehensive income	$ 37		$ 65		$ 37		$ 65		$ (392)

[1] In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.

[2] In all periods presented, there were no realized holding gains or losses and therefore no amounts were reclassified to earnings.