Summary of Changes in RSUs Outstanding (Detail) (Restricted Stock Units, USD $)	12 Months Ended
	Dec. 31, 2011
Restricted Stock Units
Restricted Stock Units
Beginning Balance	3,900,000
Granted	800,000	[1]
Vested and released	(1,500,000)
Forfeited	(100,000)
Ending Balance	3,100,000	[2],[3]
Per Share Weighted Average Grant Date Fair Value
Beginning Balance	$ 16.52
Granted	$ 38.02	[1]
Vested and released	$ 17.23
Forfeited	$ 21.48
Ending Balance	$ 21.53	[2],[3]

[1] The 0.8 million RSUs granted in 2011 consisted of 0.4 million performance-based RSUs awarded to executives and 0.4 million service-based RSUs awarded to non-executive employees and certain board members. The target number of performance-based RSUs granted was 0.3 million, which was tied to a targeted increase in the Company's subscription-based contract value ("CV") for 2011. The actual number of performance-based RSUs granted to executives could range from 0% to 200%, depending on the actual increase in CV for the year as measured on December 31, 2011. At year-end 2011, the actual CV increase achieved was 133% of the targeted amount, which resulted in the grant of 0.4 million performance-based RSUs to executives.

[2] The Company expects that substantially all of the outstanding awards at December 31, 2011 will vest in future periods.

[3] The weighted-average remaining contractual term of the outstanding RSUs is approximately 1.0 year.