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
 0 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Feb. 03, 2014
Jul. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Capped call transactions [Member]
Feb. 28, 2014
Prepaid forward share repurchase transactions [Member]
Mar. 31, 2014
Prepaid forward share repurchase transactions [Member]
Mar. 31, 2014
Foreign Currency Translation Adjustments [Member]
Mar. 31, 2014
Unrealized Gain (Loss) on Derivatives [Member]
Mar. 31, 2014
Unrealized Gain (Loss) on Available-For-Sale Investments [Member]
Stockholders Equity [Line Items]                      
Dividend declared per common share     $ 0.30 $ 0.30              
Dividend declaration date     Feb. 18, 2014                
Dividend payment date     Mar. 18, 2014                
Dividends paid     $ 30,399,000 $ 30,904,000              
Primarily dividends received relating to forward transactions     3,444,000                
Share repurchase program authorized amount 1,500,000,000 1,000,000,000                  
Share repurchase program expiration date     Jun. 30, 2017                
Forward share repurchase transactions amount             685,800,000 685,800,000      
Share repurchase transaction, shares to be purchased             9.9        
Settlement date of forward transactions             August 15, 2019        
Retained earnings     (359,025,000)   247,279,000     (653,900,000)      
Additional paid-in-capital     423,515,000   323,860,000     (31,900,000)      
Non-cash forward transaction issuance costs     35,800,000                
Non-cash interest expense     1,000,000                
Shares purchased average cost per share     $ 69.02                
Share repurchase program, remaining authorized capacity     814,200,000                
Capped call transactions with financial institutions           123,800,000          
Convertible notes initial conversion price     $ 86.28     $ 86.28          
Capped call transactions price per common share           120.79          
Increase (decrease) in additional paid-in capital           (123,800,000)          
Other comprehensive income (loss) before reclassifications, Tax benefits                 (100,000)    
Other comprehensive income (loss) before reclassifications, Tax benefits                   (100,000)  
Other comprehensive income (loss) before reclassifications, Tax benefits                     (1,100,000)
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax expense     $ 1,000,000