Financial Income, Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Interest income	$ 3,884	$ 4,507	$ 4,937
Realized gain, net on sale of available-for-sale marketable securities	379	184	54
Amortization of premium on available-for-sale marketable securities, net	(1,504)	(1,267)	(2,068)
Foreign exchange loss, net	(45)	(44)	(14)
Financial income, net	$ 2,714	$ 3,380	$ 2,909