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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2019 | Jan. 31, 2019
8.625% senior notes, due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount |  | $ 850.0 |  |
Long-term debt, interest rate (as a percent) | 8.625% | 8.625% | 8.625% |
Long-term debt, maturity year | 2019 | 2019 |  |
5.25% senior notes, due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 500.0 | $ 500.0 |  |
Long-term debt, interest rate (as a percent) | 5.25% | 5.25% |  |
Long-term debt, maturity year | 2020 | 2020 |  |
6.75% senior notes, due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 1,000.0 | $ 1,000.0 |  |
Long-term debt, interest rate (as a percent) | 6.75% | 6.75% |  |
Long-term debt, maturity year | 2020 | 2020 |  |
6.625% senior notes, due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 1,250.0 | $ 1,250.0 |  |
Long-term debt, interest rate (as a percent) | 6.625% | 6.625% |  |
Long-term debt, maturity year | 2021 | 2021 |  |
7.75% senior notes, due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 1,000.0 | $ 1,000.0 |  |
Long-term debt, interest rate (as a percent) | 7.75% | 7.75% |  |
Long-term debt, maturity year | 2022 | 2022 |  |
6% senior notes, due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 1,250.0 | $ 1,250.0 |  |
Long-term debt, interest rate (as a percent) | 6.00% | 6.00% |  |
Long-term debt, maturity year | 2023 | 2023 |  |
5.625% Operating Partnership senior notes, due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 1,050.0 | $ 1,050.0 |  |
Long-term debt, interest rate (as a percent) | 5.625% | 5.625% |  |
Long-term debt, maturity year | 2024 | 2024 |  |
5.75% senior notes, due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 1,000.0 | $ 1,000.0 |  |
Long-term debt, interest rate (as a percent) | 5.75% | 5.75% |  |
Long-term debt, maturity year | 2025 | 2025 |  |
4.50% Operating Partnership senior notes, due 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 500.0 | $ 500.0 |  |
Long-term debt, interest rate (as a percent) | 4.50% | 4.50% |  |
Long-term debt, maturity year | 2026 | 2026 |  |
4.625% senior notes, due 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 500.0 | $ 500.0 |  |
Long-term debt, interest rate (as a percent) | 4.625% | 4.625% |  |
Long-term debt, maturity year | 2026 | 2026 |  |
5.75% Operating Partnership senior notes, due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 750.0 |  |  | $ 750.0
Long-term debt, interest rate (as a percent) | 5.75% |  |  | 5.75%
Long-term debt, maturity year | 2027 |  |  |
4.50% Operating Partnership senior notes, due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 350.0 | $ 350.0 |  |
Long-term debt, interest rate (as a percent) | 4.50% | 4.50% |  |
Long-term debt, maturity year | 2028 | 2028 |  |
7% debentures, due 2036 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, principal amount | $ 0.6 | $ 0.6 |  |
Long-term debt, interest rate (as a percent) | 7.00% | 7.00% |  |
Long-term debt, maturity year | 2036 | 2036 |  |

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