Annual Activity Of RSUs (Detail) (Rsu, USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Rsu
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs, Balance at beginning of year	2,998,000	[1]	3,059,000	[1]	1,855,000
Number of RSUs, Granted at fair market value	1,809,000	[2]	1,009,000	[2]	1,960,000	[2]
Number of RSUs, Vested	(1,252,000)	[3]	(729,000)	[3]	(585,000)	[3]
Number of RSUs, Canceled	(58,000)		(341,000)		(171,000)
Number of RSUs, Balance at end of year	3,497,000	[1]	2,998,000	[1]	3,059,000	[1]
Weighted Average Grant Price, Balance at beginning of year	$ 12.74	[1]	$ 13.64	[1]	$ 19.32
Weighted Average Grant Price, Granted at fair market value	$ 14.44	[2]	$ 14.45	[2]	$ 11.55	[2]
Weighted Average Grant Price, Vested	$ 12.61	[3]	$ 14.41	[3]	$ 21.89	[3]
Weighted Average Grant Price, Canceled	$ 13.92		$ 22.32		$ 23.10
Weighted Average Grant Price, Balance at end of year	$ 13.64	[1]	$ 12.74	[1]	$ 13.64	[1]

[1] As of December 31, 2012, the Company's outstanding RSUs had aggregate intrinsic value of $69 million. Aggregate unrecognized compensation expense related to RSUs amounted to $25 million as of December 31, 2012, recognized over the weighted average vesting period of 1.6 years. The Company had approximately 1,439,000, 1,281,000 and 1,393,000 time-based awards outstanding at December 31, 2012, 2011 and 2010, respectively. Performance- and market-based awards outstanding at December 31, 2012, 2011 and 2010 were approximately 2,058,000, 1,717,000 and 1,666,000, respectively. Approximately 687,000 time-based, 440,000 market-based and no performance-based RSUs are eligible to vest in 2013, if applicable service and performance criteria are satisfied.

[2] Reflects the maximum number of RSUs assuming achievement of all performance-, market- and time-vesting criteria. During 2012, 2011 and 2010, the Company granted 835,000, 652,000 and 989,000 time-based RSUs, respectively. The number of RSUs granted does not include those for non-employee directors, which are discussed separately below.

[3] During 2012, approximately 615,000 market- and performance-based RSUs vested; no performance-based RSUs vested during 2011 and 2010.