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Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Underlying Shares
Outstanding at beginning of year | shares	6,086,250
Granted | shares	831,000
Exercised | shares
Cancelled | shares	(10,000)
Expired | shares	(600,000)
Outstanding at end of year | shares	6,307,250
Exercisable at end of year | shares	5,134,697
Weighted Average Exercise Price
Outstanding at beginning of year	$ 22.32
Granted	$ 20.06
Exercised
Cancelled	$ 16.59
Expired	26.06
Outstanding at end of year	21.68
Exercisable at end of year	$ 21.39

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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