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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 32,400   $ 33,900
Revolver draw 500,000    
Cash and cash equivalents $ 517,600    
Line of credit facility, maturity date Apr. 09, 2023    
Aggregate amount of lender commitments on credit facility $ 1,500,000    
Line of credit facility, commitment fee percentage, per annum 0.25%    
Current portion of long-term debt $ 2,455   2,435
Line of Credit Facility, Covenant Terms 0.65    
Gain on extinguishment of debt $ (17,631) $ 0  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt, Weighted Average Interest Rate 2.60%    
Line of Credit Facility, Remaining Borrowing Capacity $ 762,000    
Senior Notes Due Two Thousand And Twenty Three [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Repurchased Face Amount 33,400    
Debt Instrument, Repurchase Amount $ 19,500    
Debt Instrument, Maturity Date Apr. 15, 2023    
2022 Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Sep. 15, 2022    
4.5% Senior Notes due 2023      
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 4.50%    
Debt Instrument, Maturity Date, Description 2023    
Note payable      
Debt Instrument [Line Items]      
Notes Payable $ 22,000    
Loan term 10 years    
Debt Instrument, stated interest rate 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%    
Debt Instrument, Maturity Date, Description 2022    
3.8% Senior Notes due 2024      
Debt Instrument [Line Items]      
Debt Instrument, Repurchased Face Amount $ 7,000    
Debt Instrument, Repurchase Amount $ 3,800    
Debt Instrument, stated interest rate 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%    
Debt Instrument, Maturity Date, Description 2028    
4.9% Senior Notes due 2044      
Debt Instrument [Line Items]      
Debt Instrument, stated interest rate 4.90%    
Debt Instrument, Maturity Date, Description 2044    
Estimated Fair Value      
Debt Instrument [Line Items]      
Credit facility $ 735,000   55,000
Notes Payable 4,800   5,400
Estimated Fair Value | 5% Senior Notes due 2022      
Debt Instrument [Line Items]      
Senior notes 692,400   1,108,700
Estimated Fair Value | 3.8% Senior Notes due 2024      
Debt Instrument [Line Items]      
Senior notes 507,700   1,034,200
Estimated Fair Value | 4.375% Senior Notes Due 2028      
Debt Instrument [Line Items]      
Senior notes 463,700   1,063,700
Estimated Fair Value | 4.9% Senior Notes due 2044      
Debt Instrument [Line Items]      
Senior notes 298,600   742,000
Carrying Amount      
Debt Instrument [Line Items]      
Credit facility 735,000   55,000
Notes Payable 4,753   5,351
Carrying Amount | 5% Senior Notes due 2022      
Debt Instrument [Line Items]      
Senior notes 1,099,234   1,099,165
Carrying Amount | 3.8% Senior Notes due 2024      
Debt Instrument [Line Items]      
Senior notes 987,644   994,310
Carrying Amount | 4.375% Senior Notes Due 2028      
Debt Instrument [Line Items]      
Senior notes 989,928   989,661
Carrying Amount | 4.9% Senior Notes due 2044      
Debt Instrument [Line Items]      
Senior notes $ 691,732   $ 691,688