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Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Shares
Outstanding at beginning of year	7,827,195
Granted	692,500
Exercised	(1,190,000)
Cancelled	(10,000)
Expired
Outstanding at end of year	7,319,695
Exercisable at end of year	6,250,860
Weighted Average Exercise Price
Outstanding at beginning of year	$ 20.35
Granted	$ 22.51
Exercised	$ 16.21
Cancelled	$ 18.63
Expired
Outstanding at end of year	$ 21.23
Exercisable at end of year	$ 21.29

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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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Net 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 grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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