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Preferred Stock - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended |
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Sep. 14, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2012 | Dec. 31, 2013 Cumulative Series D Six Percent Non-Qualified Preferred Stock [Member] | Dec. 30, 2013 Cumulative Series D Six Percent Non-Qualified Preferred Stock [Member] | Dec. 31, 2012 Cumulative Series D Six Percent Non-Qualified Preferred Stock [Member] | Dec. 31, 2013 Cumulative Series E Eighteen Point Seven Five Percent Nonvoting Preferred Stock [Member] | Dec. 30, 2013 Cumulative Series E Eighteen Point Seven Five Percent Nonvoting Preferred Stock [Member] | Dec. 31, 2012 Cumulative Series E Eighteen Point Seven Five Percent Nonvoting Preferred Stock [Member] | Dec. 31, 2013 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Dec. 31, 2012 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Sep. 14, 2012 Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member] | Dec. 31, 2013 Series B Subordinated Non-Voting Cumulative Redeemable Preferred Stock | Dec. 31, 2012 Series B Subordinated Non-Voting Cumulative Redeemable Preferred Stock | Dec. 31, 2011 Series B Subordinated Non-Voting Cumulative Redeemable Preferred Stock | Dec. 31, 2012 Cumulative Series Eight Point Zero Three Four Percent Redeemable Perpetual Preferred Stock [Member] | Oct. 18, 2012 Cumulative Series Eight Point Zero Three Four Percent Redeemable Perpetual Preferred Stock [Member]
Auction Market Preferred Securities, Stock Series [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, shares authorized |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, par value per share |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  | $ 0.00 | $ 0.01 |  | $ 0.00 | $ 0.01 | $ 0.01 |  |  |  |  |  |
Stock issued for acquisition properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,480,000 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  | 6.00% |  |  | 18.75% |  |  | 6.75% |  |  |  |  |  |  |
Perpetual Preferred OP Units conversion |  | $ 0 | $ 0 | $ (200,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At The Market Offering Value |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 9,945,164 | 9,945,539 |  |  | 125 | 125 | 0 | 250 | 250 | 0 | 54,461 | 54,461 | 54,458 |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  | $ 1,000.00 |  |  | $ 1,000.00 |  |  |  | $ 2,500.00 |  |  |  |  | $ 25.00
Peferred Stock, Shares Exchanged | 5,445,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares, Issued | 5,445,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Share, Liquidation Preference Per Share | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ 0.3849625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0948460 |
Stock Redeemed or Called During Period, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,554,235 |
Stock Redeemed or Called During Period, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,100,000 |

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- Definition The value of an offering program (at the market, "ATM) that provides a potentially efficient means of raising measured amounts of equity capital over time by allowing a company to tap into the existing secondary market for its shares on an as-and-when-needed basis. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of depositary shares that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References No definition available. + Details
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- Definition A share presenting a fraction of the underlying share. A depositary share is entitled to any dividends or other benefits associated with the underlying share. + References No definition available. + Details
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- Definition Number of shares exchanged during the period as a result of the exchange of one issuance of preferred stock for another issuance of preferred stock. + References No definition available. + Details
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- Definition Preferred Stock that Can be Issued by Board of Directors Without Stockholders Approval + References No definition available. + Details
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- Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: 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 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition The amount per share used to calculated dividend payments on preferred stock. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + 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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- Definition Equity impact of the value of stock bought back by the entity at the exercise price or redemption price. + 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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