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Dividends Declared (Detail) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends Payable [Line Items]
Dividend Declared Per Share									$ 0.72	$ 0.72	$ 0.72
Dividend Declared
Dividends Payable [Line Items]
Declaration Date	Dec. 16, 2019	Sep. 12, 2019	Jun. 17, 2019	Mar. 18, 2019	Dec. 13, 2018	Sep. 17, 2018	Jun. 13, 2018	Mar. 13, 2018
Record Date	Dec. 26, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 27, 2018	Oct. 05, 2018	Jul. 07, 2018	Apr. 04, 2018
Payment Date	Jan. 24, 2020	Oct. 25, 2019	Jul. 25, 2019	Apr. 25, 2019	Jan. 24, 2019	Oct. 19, 2018	Jul. 20, 2018	Apr. 20, 2018
Dividend Declared Per Share	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18
Dividend Declared | Noncontrolling Interests
Dividends Payable [Line Items]
Declaration Date	Dec. 16, 2019	Sep. 12, 2019	Jun. 17, 2019	Mar. 18, 2019	Dec. 13, 2018	Sep. 17, 2018	Jun. 13, 2018	Mar. 13, 2018
Record Date	Dec. 26, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 27, 2018	Oct. 05, 2018	Jul. 07, 2018	Apr. 04, 2018
Payment Date	Jan. 24, 2020	Oct. 25, 2019	Jul. 25, 2019	Apr. 25, 2019	Jan. 24, 2019	Oct. 19, 2018	Jul. 20, 2018	Apr. 20, 2018
Dividend Declared Per Share	$ 0.18	$ 0.18	$ 0.18	$ 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=27012166&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=98513485&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=98513485&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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