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Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Restricted share awards (RSAs)
Sep. 30, 2013
Restricted share awards (RSAs)
Sep. 30, 2013
LTIP Performance Shares
Sep. 30, 2013
LTIP Performance Shares
Sep. 30, 2013
Stock Options
Sep. 30, 2013
Employee Stock Purchase Plan 1999
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares of common stock reserved for issuance                     1,500,000
Permitted designation for purchase of common stock under ESPP                     Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter.
Employee participating annual base compensation designated for purchase of common stock, amount                     $ 25,000
Employee participating annual base compensation designated for purchase of common stock, percent                     10.00%
Price of common stock purchased under ESPP, description                     The price for shares of common stock purchased under the ESPP is 85% of the stock's fair market value on the last business day of the three-month participation period.
Price of common stock purchased under ESPP, percent                     85.00%
Shares issued under ESPP       32,066 30,131            
Incentive plan, percentage of options expected to vest over the vesting period 94.30%     94.30%              
Incentive plan, weighted-average grant date fair value of stock options granted       $ 24.05 $ 22.89            
Incentive plan, total intrinsic value of stock options exercised       10,400,000 16,000,000            
Dividend yield                           
Awards, shares vested             24,729   327,576    
Shares withheld to pay employees             9,011   112,754    
Restricted share awards, vesting increments on anniversary dates of grants             25.00%        
Awards granted requisite service period             4 years        
Vesting percentage if employee is terminated without cause within 12 months from acquisition date           100.00% 100.00%        
Unrecognized compensation costs           2,700,000 2,700,000 9,900,000 9,900,000 7,300,000  
Unrecognized compensation costs, weighted-average recognition periods           2 years 1 month 6 days   1 year 10 months 24 days   1 year 9 months 18 days  
Stock-based compensation expenses 3,400,000 2,600,000   11,110,000 11,661,000            
Stock-based compensation expenses tax benefits 1,300,000 900,000   4,200,000 4,200,000            
Proceeds from exercises of stock options       9,892,000 15,059,000            
Actual tax benefit realized from tax deductions of option exercises       $ 3,900,000 $ 5,800,000