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v3.19.1

Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Feb. 16, 2016 | Sep. 21, 2015 | Feb. 11, 2015 | Jul. 01, 2014 | Mar. 12, 2013
6.125% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 6.125% | 6.125% |  |  |  |  | 6.125%
Senior notes maturity year | 2021 | 2021 |  |  |  |  |
5.125% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 5.125% | 5.125% |  |  |  | 5.125% |
Senior notes maturity year | 2022 | 2022 |  |  |  |  |
5.625% Senior Notes Due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 5.625% | 5.625% |  | 5.625% | 5.625% |  |
Senior notes maturity year | 2023 | 2023 |  |  |  |  |
6.500% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument interest rate | 6.50% | 6.50% | 6.50% |  |  |  |
Senior notes maturity year | 2024 | 2024 |  |  |  |  |

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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=6877327&loc=d3e13212-122682 + Details
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