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
Jul. 30, 2012
Mar. 31, 2013
Mar. 31, 2012
Stockholders Equity [Line Items]      
Dividend declared per common share   $ 0.30 $ 0.30
Dividend declaration date   Feb. 19, 2013  
Dividend payment date   Mar. 19, 2013  
Dividends paid   $ 30,904,000 $ 35,172,000
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  
Other comprehensive income (loss) before reclassifications, Tax benefits   (305,000) 1,757,000
Other comprehensive income (loss) before reclassifications, Tax benefits   (507,000) (641,000)
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   (300,000)  
Unrealized Gain (Loss) on Derivatives [Member]
      
Stockholders Equity [Line Items]      
Other comprehensive income (loss) before reclassifications, Tax benefits   $ (1,200,000)