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Financial Information for the Company and Its Subsidiaries - Additional Information (Detail) | Mar. 31, 2021 | Dec. 31, 2020 | Feb. 16, 2016 | Sep. 21, 2015 | Feb. 11, 2015
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5.500% Senior Notes Due 2028 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument interest rate | 5.50% |  |  |  |
5.000% Senior Notes Due 2029 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument interest rate | 5.00% |  |  |  |
5.625% Senior Notes Due 2023 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument interest rate | 5.625% | 5.625% |  | 5.625% | 5.625%
6.500% Senior Notes Due 2024 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument interest rate | 6.50% | 6.50% | 6.50% |  |

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