Summary of Stock Option and Stock Appreciation Rights Transactions (Detail) (Stock Option and Stock Appreciation Rights, USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option and Stock Appreciation Rights
Number of Awards
Awards outstanding at beginning of period	3,434,256	4,388,862	4,428,339
Granted			1,026,060
Exercised	(1,404,674)	(930,156)	(1,040,094)
Forfeited		(20,631)	(25,443)
Expired		(3,819)
Awards outstanding at end of period	2,029,582	3,434,256	4,388,862
Awards exercisable at end of period	1,350,409	1,760,898	1,505,325
Awards available for grant at end of period	4,690,378	4,375,683	4,270,449
Weighted Average Exercise Price
Awards outstanding at beginning of period	$ 26.95	$ 25.94	$ 23.19
Granted			$ 34.37
Exercised	$ 24.10	$ 22.28	$ 22.65
Forfeited		$ 23.62	$ 23.72
Expired		$ 23.53
Awards outstanding at end of period	$ 28.92	$ 26.95	$ 25.94
Awards exercisable at end of period	$ 27.31	$ 25.05	$ 22.23
Shares available for grant, December 31

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Share based compensation arrangement by share based payment award weighted average exercise price exercised.

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Share based compensation arrangement by share based payment award weighted average exercise price granted.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Weighted average price of options that were either forfeited or expired.

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

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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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