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Debt - Additional Information (Detail)
1 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Total debt principal     $ 6,645,600,000  
Weighted average interest rate on facility     2.90%  
Unamortized deferred debt issue costs     $ 52,600,000 $ 44,900,000
6 1/8% Senior Notes Due 2022        
Debt Instrument [Line Items]        
Debt instrument maturity year     2022 2022
Interest rate of debt instrument     6.125% 6.125%
Debt instrument, redemption prices range percentage, minimum     100.00%  
Debt instrument, redemption prices range percentage, maximum     103.00%  
1 1/8% Senior Subordinated Convertible Notes due 2034        
Debt Instrument [Line Items]        
Debt instrument maturity year     2034 2034
Interest rate of debt instrument     1.125% 1.125%
Private offering senior subordinated convertible notes, aggregate principal amount     $ 690,000,000  
Conversion rate for common stock     20.0  
Convertible note, conversion price per share | $ / shares     $ 49.91  
Principal amount of convertible notes in to shares common stock     $ 1,000  
Senior Secured Credit Facility Term Loans        
Debt Instrument [Line Items]        
Amount borrowed   $ 900,000,000    
Senior Secured Term Loan B1 Facility        
Debt Instrument [Line Items]        
Amount borrowed   $ 300,000,000    
Debt instrument maturity year   2020 2020  
Total debt principal     $ 1,100,000,000  
Senior Secured Term Loan B2 Facility        
Debt Instrument [Line Items]        
Amount borrowed   $ 600,000,000    
Debt instrument maturity year   2022 2022  
Total debt principal     $ 600,000,000  
5% Senior Notes Due in November 2023        
Debt Instrument [Line Items]        
Private offering senior notes, aggregate principal amount $ 300,000,000      
Interest rate of debt instrument 5.00%      
Debt instrument maturity year 2023-11      
Net proceeds from issuance of senior notes after deducting fees and expenses $ 296,000,000      
1 1/2% Senior Subordinated Convertible Notes Due 2019        
Debt Instrument [Line Items]        
Debt instrument maturity year     2019 2019
Total debt principal     $ 265,000,000  
Interest rate of debt instrument     1.50% 1.50%
Conversion rate for common stock     25.7  
Convertible note, conversion price per share | $ / shares     $ 38.97  
Principal amount of convertible notes in to shares common stock     $ 1,000  
1 7/8% Senior Subordinated Convertible Notes Due 2018        
Debt Instrument [Line Items]        
Debt instrument maturity year     2018 2018
Total debt principal     $ 500,000,000  
Interest rate of debt instrument     1.875% 1.875%
Conversion rate for common stock     31.8  
Convertible note, conversion price per share | $ / shares     $ 31.49  
Principal amount of convertible notes in to shares common stock     $ 1,000  
Securitization Facility        
Debt Instrument [Line Items]        
Borrowing under the credit facility     $ 500,000,000  
Debt instrument maturity year     2016-10  
Basis spread on variable rate     0.80%  
Unused line fee for securitization facility     0.40%  
Senior secured term loan A facility        
Debt Instrument [Line Items]        
Amount borrowed $ 200,000,000      
Debt instrument maturity year 2019   2019  
Total debt principal     $ 860,000,000  
Senior Secured Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument maturity year     2019  
Borrowing under the credit facility     $ 250,000,000  
Outstanding amount under the credit facility     $ 0  
Annual commitment fee percentage on unused portion of credit facility     0.35%  
Senior Secured Revolving Credit Facility | U.S. Dollar Component        
Debt Instrument [Line Items]        
Borrowing under the credit facility     $ 175,000,000  
Senior Secured Revolving Credit Facility | Multi-Currency Component        
Debt Instrument [Line Items]        
Borrowing under the credit facility     $ 75,000,000  
Senior Secured Term Loan B Facility        
Debt Instrument [Line Items]        
Debt instrument maturity year     2018  
Total debt principal     $ 650,000,000