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Dividends Declared (Detail) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable [Line Items]
Dividend Declared Per Share									$ 0.54	$ 0.72	$ 0.72
Dividend Declared
Dividends Payable [Line Items]
Declaration Date	Dec. 14, 2020	Sep. 15, 2020	Jun. 15, 2020	Mar. 16, 2020	Dec. 16, 2019	Sep. 12, 2019	Jun. 17, 2019	Mar. 18, 2019
Record Date	Dec. 30, 2020	Oct. 02, 2020	Jul. 02, 2020	Apr. 02, 2020	Dec. 26, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019
Payment Date	Jan. 22, 2021	Oct. 23, 2020	Jul. 24, 2020	Apr. 24, 2020	Jan. 24, 2020	Oct. 25, 2019	Jul. 25, 2019	Apr. 25, 2019
Dividend Declared Per Share	$ 0.12	$ 0.12	$ 0.12	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18
Dividend Declared | Noncontrolling Interests
Dividends Payable [Line Items]
Declaration Date	Dec. 14, 2020	Sep. 15, 2020	Jun. 15, 2020	Mar. 16, 2020	Dec. 16, 2019	Sep. 12, 2019	Jun. 17, 2019	Mar. 18, 2019
Record Date	Dec. 30, 2020	Oct. 02, 2020	Jul. 02, 2020	Apr. 02, 2020	Dec. 26, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019
Payment Date	Jan. 22, 2021	Oct. 23, 2020	Jul. 24, 2020	Apr. 24, 2020	Jan. 24, 2020	Oct. 25, 2019	Jul. 25, 2019	Apr. 25, 2019
Dividend Declared Per Share	$ 0.12	$ 0.12	$ 0.12	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

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+ References

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