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Organization - Schedule of Secondary Offerings (Detail) - $ / shares	Dec. 31, 2020	Aug. 28, 2020	Dec. 31, 2019	Nov. 15, 2019	Sep. 06, 2019	Aug. 08, 2019	May 23, 2019	Mar. 22, 2019	Apr. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Shares of Common Stock Sold	148,571,412		144,386,618						24,150,000
Secondary Offering [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Shares of Common Stock Sold		7,717,347		10,000,000	9,000,000	10,000,000	8,000,000	14,222,142
Public Offering Price (per share)		$ 72.18		$ 53.08	$ 56.30	$ 49.75	$ 50.50	$ 50.50

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- Definition

Organization consolidation and presentation of financial statements.

+ References

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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