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Long-Term Debt - Long-Term Debt (Detail) (USD $)
Sep. 30, 2014
May 19, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Less: Current portion of long-term debt $ (2,062,000)   $ (2,011,000)
Long-term debt, net of current portion 5,831,860,000   4,713,821,000
8.25% Senior Notes due 2019 (1)
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 8.25%    
Debt Instrument, Unamortized Discount     1,700,000
7.375% Senior Notes due 2020
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 7.375%    
Debt Instrument, Unamortized Discount 1,200,000   1,300,000
7.125% Senior Notes due 2021
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 7.125%    
Debt Instrument Carrying Value To Face Value Percentage 100.00%    
5% Senior Notes due 2022
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 5.00%    
Debt Instrument, Unamortized Premium 23,600,000   25,400,000
3.8% Senior Notes due 2024
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 3.80%    
Debt Instrument, Unamortized Discount 3,500,000    
Senior notes 1,000,000,000    
Note Payable [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 3.14%    
Note payable 22,000,000    
4.9% Senior Notes due 2044
     
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 4.90%    
Debt Instrument, Unamortized Discount 2,000,000    
Senior notes 700,000,000    
Carrying Amount
     
Debt Instrument [Line Items]      
Credit facility 0 1,010,000,000 275,000,000
Note payable 16,967,000   18,470,000
Total debt 5,833,922,000   4,715,832,000
Carrying Amount | 8.25% Senior Notes due 2019 (1)
     
Debt Instrument [Line Items]      
Senior notes 0   298,305,000
Carrying Amount | 7.375% Senior Notes due 2020
     
Debt Instrument [Line Items]      
Senior notes 198,809,000   198,695,000
Carrying Amount | 7.125% Senior Notes due 2021
     
Debt Instrument [Line Items]      
Senior notes 400,000,000   400,000,000
Carrying Amount | 5% Senior Notes due 2022
     
Debt Instrument [Line Items]      
Senior notes 2,023,568,000   2,025,362,000
Carrying Amount | 3.8% Senior Notes due 2024
     
Debt Instrument [Line Items]      
Senior notes 996,548,000   0
Carrying Amount | 4.5% Senior Notes Due 2023
     
Debt Instrument [Line Items]      
Senior notes 1,500,000,000   1,500,000,000
Carrying Amount | 4.9% Senior Notes due 2044
     
Debt Instrument [Line Items]      
Senior notes 698,030,000   0
Fair Value
     
Debt Instrument [Line Items]      
Credit facility 0   275,000,000
Note payable 15,186,000   16,500,000
Total debt 6,077,616,000   4,876,000,000
Fair Value | 8.25% Senior Notes due 2019 (1)
     
Debt Instrument [Line Items]      
Senior notes 0   327,800,000
Fair Value | 7.375% Senior Notes due 2020
     
Debt Instrument [Line Items]      
Senior notes 220,940,000   223,700,000
Fair Value | 7.125% Senior Notes due 2021
     
Debt Instrument [Line Items]      
Senior notes 443,240,000   450,300,000
Fair Value | 5% Senior Notes due 2022
     
Debt Instrument [Line Items]      
Senior notes 2,106,000,000   2,063,300,000
Fair Value | 3.8% Senior Notes due 2024
     
Debt Instrument [Line Items]      
Senior notes 1,003,900,000   0
Fair Value | 4.5% Senior Notes Due 2023
     
Debt Instrument [Line Items]      
Senior notes 1,560,000,000   1,519,400,000
Fair Value | 4.9% Senior Notes due 2044
     
Debt Instrument [Line Items]      
Senior notes $ 728,350,000   $ 0