Accumulated Other Comprehensive (Loss) Income (Detail) - Accumulated Other Comprehensive (Loss) Income by Component (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Foreign currency translation
Balance at beginning of period	$ (682)		$ 379		$ (419)		$ 345
Other comprehensive income (loss):
Foreign currency translation adjustments	540	[1]	70	[1]	277	[1]	104	[1]
Balance at end of period	(142)		449		(142)		449
Available-for-sale marketable securities
Balance at beginning of period	27		51		27		36
Other comprehensive income:
Net unrealized holding gain	(20)	[2]	(41)	[2]	(20)	[2]	(17)	[2]
Deferred income taxes	8	[2]	15	[2]	8	[2]	6	[2]
Total other comprehensive income	(12)		(26)		(12)		(11)
Balance at end of period	15		25		15		25
Total accumulated other comprehensive (loss) income	$ (127)		$ 474		$ (127)		$ 474		$ (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.