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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 $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Dividends [Line Items] |  |  |
Preferred Stockholders | $ 14,561 | $ 15,140 | $ 15,140
Common Stockholders | 29,205 | 28,135 | 27,062
Limited Partnership Unitholders | 9,956 | 9,956 | 8,339
Dividend Reinvestments, Common Stock Issued (in shares) | 475,162 | 595,388 | 498,248
Dividend Reinvestments, Limited Partnership Units Issued (in shares) | 88,309 |  |
October 31 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,206 | 3,785 | 3,785
Common Stockholders | 7,388 | 7,120 | 6,867
Limited Partnership Unitholders | 2,489 | 2,489 | 2,489
Dividend Reinvestments, Common Stock Issued (in shares) | 48,836 | 141,960 | 160,589
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 46.27 | $ 42.23 | $ 34.82
Dividend Reinvestments, Limited Partnership Units Issued (in shares) | 88,309 |  |
Dividend Reinvestments, Average Unit Price (in usd per share) | $ 46.93 |  |
July 31 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,206 | 3,785 | 3,785
Common Stockholders | 7,327 | 7,063 | 6,772
Limited Partnership Unitholders | 2,489 | 2,489 | 1,950
Dividend Reinvestments, Common Stock Issued (in shares) | 138,019 | 144,881 | 125,973
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 45.21 | $ 40.43 | $ 38.30
April 30 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 4,364 | 3,785 | 3,785
Common Stockholders | 7,272 | 7,005 | 6,730
Limited Partnership Unitholders | 2,489 | 2,489 | 1,950
Dividend Reinvestments, Common Stock Issued (in shares) | 142,839 | 145,118 | 111,592
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 42.85 | $ 38.93 | $ 42.49
January 31 |  |  |
Dividends [Line Items] |  |  |
Preferred Stockholders | 3,785 | 3,785 | 3,785
Common Stockholders | 7,218 | 6,947 | 6,693
Limited Partnership Unitholders | $ 2,489 | $ 2,489 | $ 1,950
Dividend Reinvestments, Common Stock Issued (in shares) | 145,468 | 163,429 | 100,094
Dividend Reinvestments, Discounted Share Price (in usd per share) | $ 41.67 | $ 34.44 | $ 45.92

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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