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Financial Information for the Company and Its Subsidiaries - Additional Information (Detail) | Sep. 30, 2019 | Dec. 31, 2018 | Feb. 16, 2016 | Sep. 21, 2015 | Feb. 11, 2015 | Jul. 01, 2014 | Mar. 12, 2013
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6.125% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 6.125% | 6.125% |  |  |  |  | 6.125%
5.125% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 5.125% | 5.125% |  |  |  | 5.125% |
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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