Summary of Option Activities (Detail) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Option, Number of shares, beginning balance	7,436,238	7,558,945	6,594,950
Granted, Number of Shares	2,889,750	2,966,850	2,894,500
Exercised, Number of Shares	(2,288,666)	(2,608,007)	(1,563,255)
Cancelled, Number of Shares	(416,364)	(481,550)	(367,250)
Outstanding Option, Number of shares, ending balance	7,620,958	7,436,238	7,558,945
Outstanding Option, Average Option Price, beginning balance	$ 36.31	$ 31.63	$ 25.16
Outstanding options vested and exercisable, Number of Shares	1,756,128
Granted, Average Option Price	$ 53.51	$ 37.01	$ 43.66
Exercised, Average Option Price	$ 32.27	$ 23.22	$ 26.38
Cancelled, Average Option Price	$ 43.93	$ 38.00	$ 32.60
Outstanding Option, Average Option Price, ending balance	$ 43.63	$ 36.31	$ 31.63
Outstanding options vested and exercisable, Average option price	$ 35.60
32.28 -$16.22
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High			$ 32.28
Range, Low			$ 16.22
54.79 -$38.12
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High			$ 54.79
Range, Low			$ 38.12
46.97 -$16.22
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High		$ 46.97	$ 46.97
Range, Low		$ 16.22	$ 16.22
54.79 -$16.22
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High	$ 54.79	$ 54.79	$ 54.79
Range, Low	$ 16.22	$ 16.22	$ 16.22
44.83 -$36.95
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High		$ 44.83
Range, Low		$ 36.95
79.79 -$53.38
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High	$ 79.79
Range, Low	$ 53.38
53.38 -$16.22
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High	$ 53.38
Range, Low	$ 16.22
79.79 -$30.32
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High	$ 79.79
Range, Low	$ 30.32
46.97 -$30.32
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range, High	$ 46.97
Range, Low	$ 30.32

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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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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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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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

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