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Stock Based Compensation (Stock Option Activity) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Total Number of Shares, outstanding Beginning Balance 13,159
Stock options activity, Total Number of Shares, Granted 1,235
Stock options activity, Total Number of Shares, Exercised (3,608)
Stock options activity, Total Number of Shares, Cancelled (1,792)
Total Number of Shares, outstanding Ending Balance 8,994
Total Number of Shares, exercisable 5,225
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Stock options activity, Weighted Average Exercise Price, Beginning balance $ 2.73
Stock options activity, Weighted Average Exercise Price, Granted $ 2.57
Stock options activity, Weighted Average Exercise Price, Exercised $ 1.31
Stock options activity, Weighted Average Exercise Price, Cancelled $ 2.42
Stock options activity, Weighted Average Exercise Price, Ending balance $ 3.34
Stock options activity, Weighted Average Exercise Price, exercisable $ 3.68
Stock options activity, Aggregate Intrinsic Value, Beginning balance $ 0
Stock options activity, Aggregate Intrinsic Value, Granted 0
Stock options activity, Aggregate Intrinsic Value, Exercised 13,429
Stock options activity, Aggregate Intrinsic Value, Cancelled 562
Stock options activity, Aggregate Intrinsic Value, Ending balance 1,551
Stock options activity, Aggregate Intrinsic Value, exercisable $ 1,088