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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 12, 2019
Dec. 31, 2018
Aug. 16, 2018
Debt Instrument [Line Items]              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 35,100   $ 35,100     $ 39,400  
Line of credit facility, maturity date     Apr. 09, 2023        
Aggregate amount of lender commitments on credit facility 1,500,000   $ 1,500,000        
Line of credit facility, commitment fee percentage, per annum     0.20%        
Current portion of long-term debt 2,416   $ 2,416     2,360  
Line of Credit Facility, Covenant Terms     0.65        
TotalRedemptionAmount         $ 516,500   $ 415,100
Loss on extinguishment of debt $ 4,584 $ 7,133 $ 4,584 $ 7,133      
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt, Weighted Average Interest Rate 3.60%   3.60%        
Line of Credit Facility, Remaining Borrowing Capacity $ 1,200,000   $ 1,200,000        
2022 Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Repurchased Face Amount         $ 500,000   $ 400,000
Debt Instrument, Maturity Date     Sep. 15, 2022        
Debt Instrument, Redemption Price, Percentage 100.833% 101.667%          
4.5% Senior Notes due 2023              
Debt Instrument [Line Items]              
Debt Instrument, stated interest rate 4.50%   4.50%        
Debt Instrument, Maturity Date, Description     2023        
Note payable              
Debt Instrument [Line Items]              
Notes Payable $ 22,000   $ 22,000        
Loan term     10 years        
Debt Instrument, stated interest rate 3.14%   3.14%        
Debt Instrument, Maturity Date     Feb. 26, 2022        
5% Senior Notes due 2022              
Debt Instrument [Line Items]              
Debt Instrument, stated interest rate 5.00%   5.00%        
Debt Instrument, Maturity Date, Description     2022        
3.8% Senior Notes due 2024              
Debt Instrument [Line Items]              
Debt Instrument, stated interest rate 3.80%   3.80%        
Debt Instrument, Maturity Date, Description     2024        
4.375% Senior Notes Due 2028              
Debt Instrument [Line Items]              
Debt Instrument, stated interest rate 4.375%   4.375%        
Debt Instrument, Maturity Date, Description     2028        
4.9% Senior Notes due 2044              
Debt Instrument [Line Items]              
Debt Instrument, stated interest rate 4.90%   4.90%        
Debt Instrument, Maturity Date, Description     2044        
Estimated Fair Value              
Debt Instrument [Line Items]              
Credit facility $ 300,000   $ 300,000     0  
Notes Payable 5,900   5,900     7,700  
Estimated Fair Value | 5% Senior Notes due 2022              
Debt Instrument [Line Items]              
Senior notes 1,109,400   1,109,400     1,590,900  
Estimated Fair Value | 3.8% Senior Notes due 2024              
Debt Instrument [Line Items]              
Senior notes 1,019,800   1,019,800     947,200  
Estimated Fair Value | 4.375% Senior Notes Due 2028              
Debt Instrument [Line Items]              
Senior notes 1,033,200   1,033,200     942,800  
Estimated Fair Value | 4.9% Senior Notes due 2044              
Debt Instrument [Line Items]              
Senior notes 709,600   709,600     618,800  
Carrying Amount              
Debt Instrument [Line Items]              
Credit facility 300,000   300,000     0  
Notes Payable 5,946   5,946     7,700  
Carrying Amount | 5% Senior Notes due 2022              
Debt Instrument [Line Items]              
Senior notes 1,099,097   1,099,097     1,598,404  
Carrying Amount | 3.8% Senior Notes due 2024              
Debt Instrument [Line Items]              
Senior notes 994,016   994,016     993,151  
Carrying Amount | 4.375% Senior Notes Due 2028              
Debt Instrument [Line Items]              
Senior notes 989,398   989,398     988,617  
Carrying Amount | 4.9% Senior Notes due 2044              
Debt Instrument [Line Items]              
Senior notes $ 691,644   $ 691,644     $ 691,517