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Long-Term Debt Senior Notes (Narrative) (Detail) - USD ($) $ in Thousands | 7 Months Ended | 8 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Mar. 13, 2020 | Jan. 23, 2020 | Dec. 31, 2019
Debt discount and issuance costs | $ 34,918 | $ 34,918 | $ 34,918 |  |  | $ 21,638 | [1]
Senior Notes [Member] | Senior Notes due 2029 [Member] |  |  |  |  |  |  |
Interest rate | 3.50% | 3.50% | 3.50% |  |  | 3.50% |
Senior Notes [Member] | Senior Notes due 2030 and 2050 [Member] |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |  |  |
Debt Instrument, Covenant Compliance |  |  | As of September 30, 2020, the Company was in compliance with all applicable covenants in the Indenture. |  |  |  |
Senior Notes [Member] | Senior Notes due 2030 and 2050 [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  | 101.00% |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2030 [Member] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 600,000 |  |
Interest rate | 2.60% | 2.60% | 2.60% |  | 2.60% |  |
Maturity date |  | Feb. 01, 2030 |  |  |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |  |  |
Debt issuance costs | $ 5,435 | $ 5,435 | $ 5,435 |  |  |  |
Senior Notes [Member] | Senior Notes due 2050 [Member] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 500,000 |  |  |
Interest rate | 3.05% | 3.05% | 3.05% | 3.05% |  |  |
Maturity date | Apr. 01, 2050 |  |  |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |  |  |  |
Debt issuance costs | $ 5,682 | $ 5,682 | $ 5,682 |  |  |  |
Debt discount | $ 7,375 | $ 7,375 | $ 7,375 |  |  |  |
[1] | Interest rates represent the interest rates incurred at September 30, 2020

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