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Share-Based Compensation - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 10,600,000    
Number of shares available for future issuance 3,400,000    
Stock option exercisable life 10    
Unvested Shares, Granted 230,975 341,876 264,915
Total intrinsic value of options exercised $ 23,500,000 $ 21,900,000 $ 14,400,000
Cash received from options exercised 45,800,000 33,100,000 18,100,000
Tax benefit realized for the tax deductions from stock options exercised 8,600,000 8,000,000 5,200,000
Share based compensation expense 13,102,000 12,076,000 17,358,000
Share based compensation, accrued expenses 2,000,000 800,000  
Share based compensation, other noncurrent liabilities 1,000,000    
Non-Executive [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation expense 2,300,000 800,000  
Non-Employee Directors Cliff
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of option 1 year    
Unvested Share And Unvested Share Unit Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of option 3 years    
Stock Option
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost 8,300,000    
Weighted-average period of total unrecognized compensation cost, in years 1 year 4 months 24 days    
Share based compensation expense 6,292,000 6,958,000 7,727,000
Unvested Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested Shares, Granted 230,975    
Total unrecognized compensation cost 9,400,000    
Weighted-average period of total unrecognized compensation cost, in years 1 year    
Share based compensation expense $ 6,810,000 $ 5,118,000 [1] $ 9,631,000
[1] Reflects the forfeiture of unvested shares related to the Company's transition to a new CEO in August 2011.