Income Taxes (Schedule Of Gross Unrecognized Tax Positions) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Balance as of beginning of year	$ 3,936	$ 4,128	$ 889
Additions based on tax positions related to the current year	400	500	393
Additions based on tax position related to prior year	270	109	2,846
Decreases based on tax positions related to prior year	(4)	(801)
Balance as of end of year	$ 4,602	$ 3,936	$ 4,128