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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 10, 2016
Debt Instrument [Line Items]                
Proceeds from sale of assets $ 214,800       $ 144,353 $ 631,549 $ 34,008  
Loss on extinguishment of debt (26,055) [1] $ 0 $ 0 $ 0 (554) (26,055) 0  
Total Redemption Amount               $ 623,900
Aggregate amount of lender commitments on credit facility         $ 2,750,000      
Line of credit facility, commitment fee percentage, per annum         0.30%      
Line of Credit Facility, Covenant Terms         0.65      
Proceeds from issuance of Senior Notes         $ 990,000 0 0  
Repayments of Lines of Credit         2,019,000 1,639,000 $ 1,313,000  
Current portion of long-term debt $ 2,219       2,286 2,219    
Repayment of Term Loan         500,000      
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Remaining Borrowing Capacity         2,560,000      
Senior Notes due 2028 [Domain]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount         1,000,000      
Proceeds from issuance of Senior Notes         $ 990,000      
Debt instrument, maturity date         Jan. 15, 2028      
2020 Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage 102.458%              
Debt Instrument, Face Amount               200,000
2021 Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Redemption Price, Percentage 103.563%              
Debt Instrument, Face Amount               $ 400,000
Credit Facility [Domain]                
Debt Instrument [Line Items]                
Debt, Weighted Average Interest Rate         3.19%      
Note Payable [Member]                
Debt Instrument [Line Items]                
Notes Payable         $ 22,000      
Loan period, in years         10 years      
Debt instrument, stated interest rate         3.14%      
Debt instrument, maturity date         Feb. 26, 2022      
5% Senior Notes due 2022 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate         5.00%      
Senior Notes Due 2023 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount         $ 1,500,000      
Debt instrument, maturity date         Apr. 15, 2023      
4.5% Senior Notes due 2023 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate         4.50%      
3.8% Senior Notes due 2024 [Member]                
Debt Instrument [Line Items]                
Senior notes $ 990,964         990,964    
Debt instrument, stated interest rate         3.80%      
4.375% Senior Notes Due 2028                
Debt Instrument [Line Items]                
Senior notes 0         0    
Debt instrument, stated interest rate         4.375%      
4.9% Senior Notes due 2044 [Member]                
Debt Instrument [Line Items]                
Senior notes 691,199         691,199    
Debt instrument, stated interest rate         4.90%      
Carrying Amount [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding 905,000       $ 188,000 905,000    
Notes Payable 12,176       9,974 12,176    
Carrying Amount [Member] | 5% Senior Notes due 2022 [Member]                
Debt Instrument [Line Items]                
Senior notes 1,997,188       1,997,576 1,997,188    
Carrying Amount [Member] | 4.5% Senior Notes due 2023 [Member]                
Debt Instrument [Line Items]                
Senior notes 1,484,524       1,486,690 1,484,524    
Carrying Amount [Member] | 3.8% Senior Notes due 2024 [Member]                
Debt Instrument [Line Items]                
Senior notes 990,964       992,036 990,964    
Carrying Amount [Member] | 4.375% Senior Notes Due 2028                
Debt Instrument [Line Items]                
Senior notes 0       988,061 0    
Carrying Amount [Member] | 4.9% Senior Notes due 2044 [Member]                
Debt Instrument [Line Items]                
Senior notes $ 691,199       $ 691,354 $ 691,199    
[1] See Note 7. Long-Term Debt for discussion of the loss recognized by the Company upon the redemption of its 2020 Notes and 2021 Notes in the 2016 fourth quarter