Stock Option Activity (Detail) (USD $)	6 Months Ended
Jun. 30, 2011 Year Entity
Number of Options
Outstanding at beginning of period	6,508,833
Granted	1,014,201
Exercised	(829,799)
Cancelled or expired	(153,425)
Outstanding at end of period	6,539,810
Exercisable at end of period	3,452,973
Vested and expected to vest in the future at end of period	5,923,936
Weighted Average Exercise Price per Share
Outstanding at beginning of period	$ 41.86
Granted	$ 85.35
Exercised	$ 32.54
Cancelled or expired	$ 50.88
Outstanding at end of period	$ 49.58
Exercisable at end of period	$ 39.69
Vested and expected to vest in the future at end of period	$ 48.08
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	6.90
Exercisable at end of period	5.70
Vested and expected to vest in the future at end of period	6.73
Aggregate Intrinsic Value
Outstanding at end of period	$ 258,679,846
Exercisable at end of period	170,702,765
Vested and expected to vest in the future at end of period	$ 243,208,572

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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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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The weighted average price as of the beginning of the year 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 total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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

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