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Fair Values of Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Nov. 15, 2019	Jan. 19, 2018
3.95% Senior Notes Due 2028
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt interest rate	3.95%	3.95%		3.95%
Current market rates used in measuring fair value	5.24%	4.33%
5.15% Senior Notes Due 2029
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt interest rate	5.15%	5.15%	5.15%
Current market rates used in measuring fair value	6.42%	4.81%

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- Definition

Minimum percentage of fair value transactions corroborated using observable market inputs required for level two.

+ 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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