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Long-term Debt - Long-Term Debt (Parenthetical) (Detail) | Sep. 30, 2020 | Feb. 06, 2020 | Dec. 31, 2019 | Jan. 28, 2016 | Jan. 10, 2014 | Oct. 30, 2012
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5% Senior Subordinated Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  | 5.00% |  |  | 5.00%
5 3/8% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  | 5.375% |  | 5.375% |
5 3/4% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes | 5.75% |  | 5.75% | 5.75% |  |
4 7/8% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes | 4.875% |  |  |  |  |
3 3/4% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes | 3.75% | 3.75% |  |  |  |
4% Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes | 4.00% | 4.00% |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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