Changes in Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative translation, beginning balance			$ (3,403)
Cumulative translation, Current period other comprehensive income, net			1,060
Cumulative translation, ending balance	(2,343)		(2,343)
Unrealized gains (losses) on securities, beginning balance			(11)
Unrealized gains (losses) on securities, Current period other comprehensive income, net			21
Unrealized gains (losses) on securities, ending balance	10		10
Accumulated other comprehensive income (loss), beginning balance			(3,414)
Accumulated other comprehensive income (loss), current period other comprehensive income, net	716	(1,636)	1,081	(637)
Accumulated other comprehensive income (loss), ending balance	$ (2,333)		$ (2,333)