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Debt and Other Financing Arrangements - Schedule of Debt and Other Financing Arrangements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Debt Instrument [Line Items]      
Finance lease obligations $ 85,224    
Total long-term debt and finance lease obligations 4,345,824 $ 4,260,600  
Less debt issuance costs 25,259 27,324 $ 11,900
Total amounts outstanding 4,320,565 4,233,276  
Less current maturities of long-term debt 20,000    
Less current portion of finance lease obligations 9,264    
Total long-term debt and finance lease obligations due after one year 4,291,301 4,233,276  
Notes, 4.125%, due 2022 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 600,000 600,000  
Notes, 4.0%, due 2023 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 500,000 500,000  
Notes, 3.95%, due 2028 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 500,000 500,000 500,000
Notes, 6.40%, due 2037 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 650,000 650,000  
Notes, 5.20%, due 2043 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 500,000 500,000  
Notes, 4.40%, due 2048 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 500,000 500,000 $ 500,000
Industrial Revenue Bonds [Member] | Due from 2020 to 2040 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount $ 1,010,600 $ 1,010,600