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Dividends Declared (Detail) - Noncontrolling Interests - Dividend Declared - $ / shares	1 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017
Dividends Payable [Line Items]
Declaration Date	Jul. 14, 2017	Jul. 14, 2017		Apr. 12, 2017	Apr. 12, 2017	Apr. 12, 2017	Jan. 12, 2017	Jan. 12, 2017	Jan. 12, 2017
Record Date	Sep. 29, 2017	Aug. 31, 2017		Jun. 30, 2017	May 31, 2017	Apr. 28, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017
Payment Date	Oct. 13, 2017	Sep. 15, 2017		Jul. 17, 2017	Jun. 15, 2017	May 15, 2017	Apr. 17, 2017	Mar. 15, 2017	Feb. 15, 2017
Dividend Declared Per Share	$ 0.06	$ 0.06		$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06
Scenario, Forecast
Dividends Payable [Line Items]
Declaration Date	Jul. 14, 2017	Jul. 14, 2017
Record Date	Sep. 29, 2017	Aug. 31, 2017
Payment Date	Oct. 13, 2017	Sep. 15, 2017
Dividend Declared Per Share	$ 0.06	$ 0.06
Subsequent Event
Dividends Payable [Line Items]
Declaration Date			Jul. 14, 2017
Record Date			Jul. 31, 2017
Payment Date			Aug. 15, 2017
Dividend Declared Per Share			$ 0.06

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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