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Fair Value Measurements - Additional Information (Detail)	Dec. 31, 2020	Oct. 14, 2020	Jun. 24, 2020	Dec. 31, 2019	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%
5.125% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.125%			5.125%				5.125%
5.625% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.625%			5.625%		5.625%	5.625%
6.500% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	6.50%			6.50%	6.50%
5.500% Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.50%		5.50%	5.50%
5.000% Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	5.00%	5.00%		5.00%

X

- 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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