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Stock Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Underlying Shares
Outstanding at beginning of period	7,081,295
Granted	790,000
Exercised	(17,800)
Outstanding at end of period	7,853,495
Exercisable at end of period	6,669,491
Weighted Average Exercise Price
Outstanding at beginning of period	$ 20.73
Granted	$ 16.54
Exercised	$ 14.64
Outstanding at end of period	$ 20.33
Exercisable at end of period	$ 20.61

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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