Distributions To Noncontrolling Interest

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Dividends [Line Items]

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- Definition

Percentage Of Discount On Common Stock

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

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Cash dividends declared or paid to each outstanding limited partnership unit during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section F

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Reference 2: 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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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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

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Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Jan. 29, 2016	Jan. 15, 2016	Jan. 07, 2016	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends [Line Items]
Common stock issued, discount rate					3.00%
Common stock distributions (in usd per share)					$ 1.69	$ 1.56	$ 1.44
Dividends declared per common share outstanding (in usd per share)				$ 0.43
Distribution to limited partnership unitholders					$ 12,228	$ 11,117	$ 9,956
Dividend Income
Dividends [Line Items]
Common stock distributions (in usd per share)					$ 1.69	$ 1.56	$ 0.96
Return on Invested Capital
Dividends [Line Items]
Common stock distributions (in usd per share)							0.48
Series A Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)						2.41	2.00
Series B Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)							0.99
Series C Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)					$ 1.72	$ 1.72	$ 1.09
Subsequent Event
Dividends [Line Items]
Common stock dividend paid	$ 9,100
Distribution to limited partnership unitholders	$ 3,100
Distribution to limited partnership unitholders (in usd per share)	$ 0.43
Subsequent Event \| Series C Preferred Stock
Dividends [Line Items]
Dividends declared per preferred share outstanding (in usd per share)			$ 0.4297
Preferred stock distributions		$ 3,100