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Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding Beginning Balance 22,022
Exercise of stock options, net of stock withholdings (744)
Number of Options Outstanding Ending Balance 21,278
Number of Options exercisable at March 31 ,2013 21,278
Weighted Average Exercise Price Beginning Balance $ 7.63
Weighted Average Exercise Price Exercised $ 7.63
Weighted Average Exercise Price Ending Balance $ 7.63
Weighted Average Exercise Price, Options Exercisable at March 31 ,2013 $ 7.63
Aggregate Intrinsic, Value $ 464
Aggregate Intrinsic Value, Options Exercisable at March 31, 2013 $ 464