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Debt and Other Financing Arrangements - Schedule of Debt and Other Financing Arrangements (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | May 31, 2020 | Dec. 31, 2019 | Apr. 30, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Finance lease obligations | $ 90,338 |  | $ 85,224 |
Total long-term debt and finance lease obligations | 5,493,578 |  | 4,345,824 |
Less premium on debt exchange | 180,045 |  |  |
Less debt issuance costs | 30,859 | $ 8,400 | 25,259 | $ 11,900
Total amounts outstanding | 5,282,674 |  | 4,320,565 |
Less current maturities of long-term debt |  |  | 20,000 |
Less current portion of finance lease obligations | 10,885 |  | 9,264 |
Total long-term debt and finance lease obligations due after one year | 5,271,789 |  | 4,291,301 |
Notes, 4.125%, due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 600,000 |  | 600,000 |
Notes, 4.000%, due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 500,000 |  | 500,000 |
Notes, 2.000%, due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 500,000 |  |  |
Notes, 3.950%, due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 500,000 |  | 500,000 | 500,000
Notes, 2.700%, due 2030 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 500,000 |  |  |
Notes, 6.400%, due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 543,331 |  | 650,000 |
Notes, 5.200%, due 2043 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 338,133 |  | 500,000 |
Notes, 4.400%, due 2048 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 329,219 |  | 500,000 | $ 500,000
Notes, 2.979%, due 2055 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | 439,317 |  |  |
Industrial Revenue Bonds [Member] | Due from 2022 to 2040 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | $ 1,153,240 |  | $ 1,010,600 |

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