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Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) - USD ($) $ / shares in Units, $ in Thousands												1 Months Ended	12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends [Line Items]
Preferred Stockholders													$ 12,375	$ 13,474	$ 14,561
Common Stockholders													35,645	32,346	29,205
Limited Partnership Unitholders													$ 12,228	$ 11,117	$ 9,956
Dividend Reinvestments, Common Stock Issued (in shares)													201,212	197,638	475,162
Dividend Reinvestments, Limited Partnership Units Issued (in shares)													107,037	196,183	88,309
October 31
Dividends [Line Items]
Preferred Stockholders	$ 3,094				$ 3,856				$ 3,206
Common Stockholders	9,106				8,348				7,388
Limited Partnership Unitholders	$ 3,129				$ 2,879				$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)	47,313				40,142				48,836
Dividend Reinvestments, Discounted Share Price (in usd per share)	$ 55.73				$ 52.71				$ 46.27
Dividend Reinvestments, Limited Partnership Units Issued (in shares)	28,936								88,309
Dividend Reinvestments, Average Unit Price (in usd per share)	$ 55.73								$ 46.93
July 31
Dividends [Line Items]
Preferred Stockholders		$ 3,094				$ 3,206						$ 3,206
Common Stockholders		9,081				8,314						7,327
Limited Partnership Unitholders		$ 3,115				$ 2,879						$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)		56,003				57,696						138,019
Dividend Reinvestments, Discounted Share Price (in usd per share)		$ 50.30				$ 46.79						$ 45.21
Dividend Reinvestments, Limited Partnership Units Issued (in shares)		32,041
Dividend Reinvestments, Average Unit Price (in usd per share)		$ 50.30
April 30
Dividends [Line Items]
Preferred Stockholders			$ 3,094				$ 3,206			$ 4,364
Common Stockholders			9,055				8,269			7,272
Limited Partnership Unitholders			$ 3,104				$ 2,838			$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)			54,921				60,212			142,839
Dividend Reinvestments, Discounted Share Price (in usd per share)			$ 50.21				$ 44.14			$ 42.85
Dividend Reinvestments, Limited Partnership Units Issued (in shares)			25,264				104,831
Dividend Reinvestments, Average Unit Price (in usd per share)			$ 50.21				$ 44.77
January 31
Dividends [Line Items]
Preferred Stockholders				$ 3,093				$ 3,206			$ 3,785
Common Stockholders				8,403				7,415			7,218
Limited Partnership Unitholders				$ 2,880				$ 2,521			$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)				42,975				39,588			145,468
Dividend Reinvestments, Discounted Share Price (in usd per share)				$ 56.74				$ 45.15			$ 41.67
Dividend Reinvestments, Limited Partnership Units Issued (in shares)				20,796				91,352
Dividend Reinvestments, Average Unit Price (in usd per share)								$ 45.80					$ 56.74

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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