v2.4.0.6

Stockholders' Equity (Stock Option Activity) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Options outstanding beginning balance (in shares)	1,507,519
Number of Shares, Options granted (in shares)	0
Number of Shares, Options exercised (in shares)	(362,680)
Number of Shares, Options forfeited (in shares)	(1,048,478)
Number of Shares, Options expired (in shares)	(255)
Number of Shares, Options outstanding ending balance (in shares)	96,106
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Options outstanding beginning balance (in dollars per share)	$ 13.02
Weighted-Average Exercise Price, Options granted (in dollars per share)	$ 0
Weighted-Average Exercise Price, Options exercised (in dollars per share)	$ 0.61
Weighted-Average Exercise Price, Options forfeited (in dollars per share)	$ 18.12
Weighted-Average Exercise Price, Options expired (in dollars per share)	$ 8.87
Weighted-Average Exercise Price, Options outstanding ending balance (in dollars per share)	$ 4.31
Weighted Average Remaining Contractual Term, Options outstanding (in years)	3 years 1 month 28 days
Aggregate Intrinsic Value, Options exercised	$ 4,993
Aggregate Intrinsic Value, Options outstanding	$ 1,051

X

- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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

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- Definition

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

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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