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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 55
-Paragraph 8
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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