Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Detail)

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Shareholders' Equity - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 30, 2012
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stockholders Equity [Line Items]              
Dividend declared per common share   $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.90 $ 0.90
Dividend declaration date   Jul. 29, 2013 Apr. 29, 2013 Feb. 19, 2013      
Dividend payment date   Aug. 27, 2013 May 28, 2013 Mar. 19, 2013      
Dividends paid   $ 30,800,000 $ 30,900,000 $ 30,900,000 $ 32,400,000 $ 92,651,000 $ 102,687,000
Share repurchase program authorized amount 1,000,000,000            
Share repurchase program expiration date           Jun. 30, 2017  
Repurchase of common shares   1.7   4.0      
Shares repurchased through open market purchases, aggregate cost   110,000,000   162,400,000      
Average cost per share of shares repurchased   $ 63.85   $ 40.61      
Share repurchase program, remaining authorized capacity           677,600,000  
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax expense           800,000  
Foreign Currency Translation Adjustment [Member]
              
Stockholders Equity [Line Items]              
Other comprehensive income (loss) before reclassifications, Tax benefits           (3,600,000)  
Unrealized Gain (Loss) on Derivatives [Member]
              
Stockholders Equity [Line Items]              
Other comprehensive income (loss) before reclassifications, Tax benefits           $ 700,000