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Summary of Activity Related to Stock Options Granted Under Company's Incentive Plan (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total Shares outstanding, beginning balance 4,964  
Total Shares, granted     
Total Shares, exercised (339)  
Total Shares, forfeited, canceled or expired (122)  
Total Shares outstanding, ending balance 4,503  
Total Shares, exercisable 2,153  
Total Shares, available for issuance 2,767  
Weighted Average Exercise Price per Share Outstanding, beginning balance $ 14.47  
Weighted Average Exercise Price per Share, granted     
Weighted Average Exercise Price per Share, exercised $ 12.80  
Weighted Average Exercise Price per Share, forfeited, Cancelled or expired $ 17.65  
Weighted Average Exercise Price per Share Outstanding, ending balance $ 14.51  
Weighted Average Exercise Price per Share, exercisable $ 13.76  
Weighted Average Remaining Contractual Term (Years), Outstanding 6 years 11 months 9 days  
Weighted Average Remaining Contractual Term (Years), Exercisable 6 years 6 months 18 days  
Aggregate Intrinsic Value, Outstanding $ 40,618 [1]  
Aggregate Intrinsic Value, Exercisable $ 21,031 [1]  
Value of closing stock price   $ 23.53
[1] (1) Aggregate intrinsic value represents the value of the University's closing stock price on September 28, 2012 ($23.53) in excess of the exercise price multiplied by the number of options outstanding or exercisable.