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Dividends Declared (Detail) - Dividend Declared - $ / shares		12 Months Ended
	Jan. 14, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
January
Dividends Payable [Line Items]
Record Date		Jan. 30, 2015	Jan. 31, 2014
Payment Date		Feb. 17, 2015	Feb. 17, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
January | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Jan. 30, 2015
Payment Date		Feb. 17, 2015
Dividend Declared Per Share		$ 0.06
January | Subsequent Event
Dividends Payable [Line Items]
Record Date	Jan. 29, 2016
Payment Date	Feb. 16, 2016
Dividend Declared Per Share	$ 0.06
January | Subsequent Event | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date	Jan. 29, 2016
Payment Date	Feb. 16, 2016
Dividend Declared Per Share	$ 0.06
February
Dividends Payable [Line Items]
Record Date		Feb. 27, 2015	Feb. 28, 2014
Payment Date		Mar. 16, 2015	Mar. 17, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
February | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Feb. 27, 2015
Payment Date		Mar. 16, 2015
Dividend Declared Per Share		$ 0.06
February | Subsequent Event
Dividends Payable [Line Items]
Record Date	Feb. 29, 2016
Payment Date	Mar. 15, 2016
Dividend Declared Per Share	$ 0.06
February | Subsequent Event | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date	Feb. 29, 2016
Payment Date	Mar. 15, 2016
Dividend Declared Per Share	$ 0.06
March
Dividends Payable [Line Items]
Record Date		Mar. 31, 2015	Mar. 31, 2014
Payment Date		Apr. 15, 2015	Apr. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
March | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Mar. 31, 2015
Payment Date		Apr. 15, 2015
Dividend Declared Per Share		$ 0.06
March | Subsequent Event
Dividends Payable [Line Items]
Record Date	Mar. 31, 2016
Payment Date	Apr. 15, 2016
Dividend Declared Per Share	$ 0.06
March | Subsequent Event | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date	Mar. 31, 2016
Payment Date	Apr. 15, 2016
Dividend Declared Per Share	$ 0.06
April
Dividends Payable [Line Items]
Record Date		Apr. 30, 2015	Apr. 30, 2014
Payment Date		May 15, 2015	May 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
April | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Apr. 30, 2015
Payment Date		May 15, 2015
Dividend Declared Per Share		$ 0.06
May
Dividends Payable [Line Items]
Record Date		May 29, 2015	May 30, 2014
Payment Date		Jun. 15, 2015	Jun. 16, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
May | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		May 29, 2015
Payment Date		Jun. 15, 2015
Dividend Declared Per Share		$ 0.06
June
Dividends Payable [Line Items]
Record Date		Jun. 30, 2015	Jun. 30, 2014
Payment Date		Jul. 15, 2015	Jul. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
June | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Jun. 30, 2015
Payment Date		Jul. 15, 2015
Dividend Declared Per Share		$ 0.06
July
Dividends Payable [Line Items]
Record Date		Jul. 31, 2015	Jul. 31, 2014	Aug. 05, 2013
Payment Date		Aug. 17, 2015	Aug. 15, 2014	Aug. 15, 2013
Dividend Declared Per Share		$ 0.06	$ 0.06	$ 0.05333
July | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Jul. 31, 2015	Jul. 31, 2014
Payment Date		Aug. 17, 2015	Aug. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
August
Dividends Payable [Line Items]
Record Date		Aug. 31, 2015	Aug. 29, 2014	Aug. 30, 2013
Payment Date		Sep. 15, 2015	Sep. 15, 2014	Sep. 13, 2013
Dividend Declared Per Share		$ 0.06	$ 0.06	$ 0.05333
August | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Aug. 31, 2015	Aug. 29, 2014
Payment Date		Sep. 15, 2015	Sep. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
September
Dividends Payable [Line Items]
Record Date		Sep. 15, 2015	Sep. 30, 2014	Sep. 30, 2013
Payment Date		Oct. 15, 2015	Oct. 15, 2014	Oct. 15, 2013
Dividend Declared Per Share		$ 0.034	$ 0.06	$ 0.05333
September | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Sep. 15, 2015	Sep. 30, 2014
Payment Date		Oct. 15, 2015	Oct. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
September
Dividends Payable [Line Items]
Record Date		Sep. 30, 2015
Payment Date		Oct. 15, 2015
Dividend Declared Per Share		$ 0.026
October
Dividends Payable [Line Items]
Record Date		Oct. 30, 2015	Oct. 31, 2014	Oct. 31, 2013
Payment Date		Nov. 16, 2015	Nov. 17, 2014	Nov. 15, 2013
Dividend Declared Per Share		$ 0.06	$ 0.06	$ 0.05333
October | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Oct. 30, 2015	Oct. 31, 2014
Payment Date		Nov. 16, 2015	Nov. 17, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
November
Dividends Payable [Line Items]
Record Date		Nov. 30, 2015	Nov. 28, 2014	Nov. 29, 2013
Payment Date		Dec. 15, 2015	Dec. 15, 2014	Dec. 16, 2013
Dividend Declared Per Share		$ 0.06	$ 0.06	$ 0.05333
November | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Nov. 30, 2015	Nov. 28, 2014
Payment Date		Dec. 15, 2015	Dec. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06
December
Dividends Payable [Line Items]
Record Date		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Payment Date		Jan. 15, 2016	Jan. 15, 2015	Jan. 15, 2014
Dividend Declared Per Share		$ 0.06	$ 0.06	$ 0.05333
December | Noncontrolling Interests
Dividends Payable [Line Items]
Record Date		Dec. 31, 2015	Dec. 31, 2014
Payment Date		Jan. 15, 2016	Jan. 15, 2015
Dividend Declared Per Share		$ 0.06	$ 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=6367179&loc=d3e4304-108586

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- Definition

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