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Debt and Other Financing Arrangements - Schedule of Debt and Other Financing Arrangements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Total long-term debt $ 4,260,600   $ 3,760,600
Less debt issuance costs 27,324 $ 11,900 18,358
Total amounts outstanding 4,233,276   3,742,242
Less current maturities     500,000
Total long-term debt due after one year 4,233,276   3,242,242
Notes, 5.85%, due June 1st, 2018 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     500,000
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  
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  
Industrial Revenue Bonds [Member] | Due from 2020 to 2040 [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount $ 1,010,600   $ 1,010,600