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Stock Option Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012
Underlying Shares
Outstanding at beginning of period	7,081,295
Granted	40,000
Exercised	(13,300)
Outstanding at end of period	7,107,995
Exercisable at end of period	6,279,644
Weighted Average Exercise Price
Outstanding at beginning of period	$ 20.73
Granted	$ 19.98
Exercised	$ 14.64
Outstanding at end of period	$ 20.74
Exercisable at end of period	$ 20.52

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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 weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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Net number of share options (or share units) granted during the period.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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