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Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Shares
Outstanding at beginning of year	7,081,295
Granted	815,000
Exercised	(63,800)
Cancelled
Expired	(5,300)
Outstanding at end of year	7,827,195
Exercisable at end of year	6,735,056
Weighted Average Exercise Price
Outstanding at beginning of year	$ 20.73
Granted	$ 16.52
Exercised	$ 14.64
Cancelled
Expired	$ 14.64
Outstanding at end of year	$ 20.35
Exercisable at end of year	$ 20.63

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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 under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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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