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Dividends Declared (Detail) - Dividend Declared - $ / shares	1 Months Ended												3 Months Ended
	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	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	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Dividends Payable [Line Items]
Declaration Date	Oct. 12, 2017	Oct. 12, 2017	Oct. 12, 2017	Jul. 14, 2017	Jul. 14, 2017	Jul. 14, 2017	Apr. 12, 2017	Apr. 12, 2017	Apr. 12, 2017	Jan. 12, 2017	Jan. 12, 2017	Jan. 12, 2017	Dec. 13, 2017	Sep. 17, 2018	Jun. 13, 2018	Mar. 13, 2018
Record Date	Dec. 29, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 29, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 28, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 27, 2018	Oct. 05, 2018	Jul. 07, 2018	Apr. 04, 2018
Payment Date	Jan. 17, 2018	Dec. 15, 2017	Nov. 15, 2017	Oct. 13, 2017	Sep. 15, 2017	Aug. 15, 2017	Jul. 17, 2017	Jun. 15, 2017	May 15, 2017	Apr. 17, 2017	Mar. 15, 2017	Feb. 15, 2017	Jan. 24, 2019	Oct. 19, 2018	Jul. 20, 2018	Apr. 20, 2018
Dividend Declared Per Share	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.18	$ 0.18	$ 0.18	$ 0.18
Noncontrolling Interests
Dividends Payable [Line Items]
Declaration Date	Oct. 12, 2017	Oct. 12, 2017	Oct. 12, 2017	Jul. 14, 2017	Jul. 14, 2017	Jul. 14, 2017	Apr. 12, 2017	Apr. 12, 2017	Apr. 12, 2017	Jan. 12, 2017	Jan. 12, 2017	Jan. 12, 2017	Dec. 13, 2017	Sep. 17, 2018	Jun. 13, 2018	Mar. 13, 2018
Record Date	Dec. 29, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 29, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 28, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 27, 2018	Oct. 05, 2018	Jul. 07, 2018	Apr. 04, 2018
Payment Date	Jan. 15, 2018	Dec. 15, 2017	Nov. 15, 2017	Oct. 13, 2017	Sep. 15, 2017	Aug. 15, 2017	Jul. 17, 2017	Jun. 15, 2017	May 15, 2017	Apr. 17, 2017	Mar. 15, 2017	Feb. 15, 2017	Jan. 24, 2019	Oct. 19, 2018	Jul. 20, 2018	Apr. 20, 2018
Dividend Declared Per Share	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 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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X

- 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

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

No definition available.

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