Annual Activity Of Stock Option Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Balance at beginning of year	3,432	[1]	5,026	[1]	7,196
Number of Options, Granted at fair market value					160
Number of Options, Exercised	(756)	[2]	(1,231)	[2]	(982)	[2]
Number of Options, Canceled/forfeited/expired	(775)		(363)		(1,348)
Number of Options, Balance at end of year	1,901	[1]	3,432	[1]	5,026	[1]
Weighted Average Exercise Price, Balance at beginning of year	$ 7.90	[1]	$ 7.22	[1]	$ 11.30
Weighted Average Exercise Price, Granted at fair market value					$ 11.53
Weighted Average Exercise Price, exercised	$ 0.86	[2]	$ 0.98	[2]	$ 8.45	[2]
Weighted Average Exercise Price, canceled/forfeited/expired	$ 27.04		$ 21.97		$ 28.63
Weighted Average Exercise Price, Balance at end of year	$ 2.89	[1]	$ 7.90	[1]	$ 7.22	[1]

[1] As of December 31, 2012, the Company's outstanding stock options had an aggregate intrinsic value of $32 million; there were 1.9 million "in-the-money" stock options; and the aggregate unrecognized compensation expense related to unvested stock options was $1 million, to be recognized over 2.1 years. Approximately 1.8 million stock options are exercisable as of December 31, 2012 and approximately 32,000 stock options are eligible to vest in 2013.

[2] Stock options exercised during 2012 and 2011 had intrinsic values of $11 million and $18 million, respectively.