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Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Oct. 14, 2020	Jun. 24, 2020	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
5.500% Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.50%	5.50%		5.50%
Senior notes maturity year	2028	2028
5.000% Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.00%	5.00%	5.00%
Senior notes maturity year	2029	2029

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Date when the debt instrument is scheduled to be fully repaid.

+ References

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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=120391452&loc=d3e13212-122682

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