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Stock Plans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options exercisable period after grant date 3 years    
Restricted stock vest period after grant date 3 years    
Share-based Compensation Arrangement by Share-base Payment Award, Fair Value Assumptions, Average Closing Price Used to Calculate Expected Dividend Rate, Period 1 year    
Stock options expiration period 10 years    
Cash proceeds from exercise of options $ 9,643,000 $ 4,306,000 $ 1,316,000
Excess tax benefit (provision) related to stock plans 2,246,000 2,799,000 632,000
Aggregate intrinsic value of stock options exercisable 22,700,000    
Aggregate intrinsic value of stock options outstanding 28,200,000    
Total intrinsic value of stock options exercised 4,000,000 4,400,000 1,800,000
Unrecognized stock-based compensation expense 5,400,000    
Weighted average period over which unrecognized stock-based compensation expense is expected to be recognized, in years 1 year    
Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target award based on achieving targeted performance conditions 0.00%    
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target award based on achieving targeted performance conditions 200.00%    
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Excess tax benefit (provision) related to stock plans 500,000 1,600,000 700,000
Restricted Stock Activity
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of stock units vested 9,700,000 8,000,000 2,600,000
Performance Stock Unit Activity
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of stock units vested $ 2,300,000    
Management
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future grants 1,752,369    
Non Employee Directors
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future grants 183,702