Information with Respect to Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2011 Year Entity
Shares
Beginning Balance	7,403
Granted	386
Exercised	(809)
Forfeited	(65)
Ending Balance	6,915
Exercisable at September 30, 2011	5,888
Vested and expected to vest at September 30, 2011	6,864
Weighted-Average Exercise Price
Beginning Balance	$ 18.69
Granted	$ 35.22
Exercised	$ 13.65
Forfeited	$ 26.19
Ending Balance	$ 20.14
Exercisable at September 30, 2011	$ 18.42
Vested and expected to vest at September 30, 2011	$ 20.06
Weighted-Average Remaining Contractual Term (in years)
Beginning Balance	5.6
Ending Balance	5.1
Exercisable at September 30, 2011	4.5
Vested and expected to vest at September 30, 2011	4.5
Aggregate Intrinsic Value
Outstanding at September 30, 2011	$ 46,890
Exercisable at September 30, 2011	46,571
Vested and expected to vest at September 30, 2011	$ 46,874

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

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [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 grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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

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

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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 stock options awarded under the plan during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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