Stock Option Plans (Detail) (USD $)	6 Months Ended
Jun. 30, 2012
Weighted Average price Per Share
Outstanding, Weighted Average Price Per Share, Beginning Balance	$ 10.97
Granted, Weighted Average Price	$ 17.50
Cancelled, Weighted Average Price	$ 12.93
Exercised, Weighted Average Price	$ 14.95
Outstanding, Weighted Average Price Per Share, Ending Balance	$ 12.39
Number of Shares
Outstanding, Number of Shares, Beginning Balance	2,912,000
Granted, Number of Shares	601,000
Cancelled, Number of Shares	(69,000)
Exercised, Number of Shares	(333,000)
Outstanding, Number of Shares, Ending Balance	3,111,000
Options exercisable, Number of Shares	1,469,000
Weighted Average Remaining Contractual Life
Outstanding, Weighted Average Remaining Contractual Life (In Years)	6 years 131 days
Options exercisable, Weighted Average Remaining Contractual Life (In Years)	4 years 99 days
Aggregate Intrinsic Value
Outstanding, Aggregate Intrinsic Value	$ 21,738,000
Options exercisable, Aggregate Intrinsic Value	$ 15,129,000

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, 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 or that expired.

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

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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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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 remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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