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 6 Months Ended
Jul. 30, 2012
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stockholders Equity [Line Items]            
Dividend declared per common share   $ 0.30 $ 0.30 $ 0.30 $ 0.60 $ 0.60
Dividend declaration date   Apr. 29, 2013 Feb. 19, 2013      
Dividend payment date   May 28, 2013 Mar. 19, 2013      
Dividends paid   $ 30,900,000 $ 30,900,000 $ 35,100,000 $ 61,823,000 $ 70,310,000
Share repurchase program authorized amount 1,000,000,000          
Share repurchase program expiration date         Jun. 30, 2017  
Repurchase of common shares     4.0      
Shares repurchased through open market purchases, aggregate cost     162,400,000      
Average cost per share of shares repurchased     $ 40.61      
Share repurchase program, remaining authorized capacity         787,600,000  
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax expense         700,000  
Foreign Currency Translation Adjustment [Member]
            
Stockholders Equity [Line Items]            
Other comprehensive income (loss) before reclassifications, Tax benefits         1,800,000  
Unrealized Gain (Loss) on Derivatives [Member]
            
Stockholders Equity [Line Items]            
Other comprehensive income (loss) before reclassifications, Tax benefits         $ 1,000,000