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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 | Mar. 01, 2012 Maximum [Member] | Feb. 28, 2011 Maximum [Member] | Dec. 31, 2012 ATM [Member] | Dec. 31, 2011 ATM [Member] | Dec. 31, 2010 ATM [Member] | May 04, 2010 ATM [Member] | Dec. 31, 2010 Drip [Member] | May 27, 2004 Series F Preferred Stock [Member] | Dec. 31, 2012 Series F Preferred Stock [Member] | Dec. 31, 2012 Series F Preferred Stock [Member] | May 27, 2004 Series G Preferred Stock [Member] | Dec. 31, 2012 Series G Preferred Stock [Member] | Dec. 31, 2012 Series G Preferred Stock [Member] Scenario, Forecast [Member] | Dec. 31, 2012 Common stock [Member] | Dec. 31, 2011 Common stock [Member] | Dec. 31, 2012 Common stock [Member] ATM [Member] | Dec. 31, 2011 Common stock [Member] ATM [Member] | Dec. 31, 2010 Common stock [Member] ATM [Member] | Mar. 01, 2012 Common stock [Member] ATM [Member] | Feb. 28, 2011 Common stock [Member] ATM [Member] | Dec. 31, 2010 Common stock [Member] Drip [Member] | Dec. 31, 2012 Series F Cumulative Preferred Stock [Member] | Jan. 13, 2006 Series J Preferred Stock [Member] | Dec. 31, 2012 Series J Preferred Stock [Member] | Dec. 31, 2012 Series J Preferred Stock [Member] | Dec. 31, 2011 Series J Preferred Stock [Member] | Dec. 31, 2010 Series J Preferred Stock [Member] | Aug. 21, 2006 Series K Preferred Stock [Member] | Dec. 31, 2012 Series K Preferred Stock [Member] | Dec. 31, 2011 Series K Preferred Stock [Member] | Dec. 31, 2010 Series K Preferred Stock [Member] | Dec. 31, 2012 Convertible Common Stock [Member] | Dec. 31, 2011 Convertible Common Stock [Member] | Dec. 31, 2010 Convertible Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue date of depositary shares |  |  |  |  |  |  |  |  |  | May 27, 2004 |  |  | May 27, 2004 |  |  |  |  |  |  |  |  |  |  |  | Jan. 13, 2006 |  |  |  |  | Aug. 21, 2006 |  |  |  |  |  |
Depositary Shares issued |  |  |  |  |  |  |  |  |  | 50,000 |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  | 2,000,000 |  |  |  |  |  |
Dividend Rate Per Share |  |  |  |  |  |  |  |  |  |  |  | 6.236% |  | 7.236% |  |  |  |  |  |  |  |  |  |  |  |  | 7.25% |  |  |  | 7.25% |  |  |  |  |
Depositary share percentage per share |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Par value of each depository shares |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 |  |  |  |  |  |
Initial offering price per depository share |  |  |  |  |  |  |  |  |  | $ 1,000.00 |  |  | $ 1,000.00 |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  | $ 25.00 |  |  |  |  |  |
Number of years of U.S treasury rate one |  |  |  |  |  |  |  |  |  |  | 30 years | 30 years |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum fixed coupon rate of preferred stock |  |  |  |  |  |  |  |  |  |  | 2.375% | 2.375% |  |  |  |  |  |  |  |  |  |  |  | 2.375% |  |  |  |  |  |  |  |  |  |  |  |
Number of years of U.s treasury rate two |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate |  |  |  |  |  |  |  |  |  |  | 3-month LIBOR | 3-month LIBOR |  | 3-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New coupon rate of preferred stock |  |  |  |  |  |  |  |  |  |  | 5.285% | 5.285% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 | $ 1,000.00 |  |  | $ 1,000.00 |  |  |  |  |  |  |  |  |  |  | $ 25.00 | $ 25.00 |  |  |  | $ 25.00 |  |  |  |  |
Aggregate redemption price | $ (50,044) | $ (50,044) |  |  |  |  |  |  |  |  | $ 50,000 | $ 50,000 |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalent to per depositary share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rates during floating rate periods |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption date of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend exception rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.25% |  |  |  |  |  |  |  |  |
Depositary Shares redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |
Dividend per share, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.407812 | $ 2.2657 | $ 1.3594 | $ 1.8125 |  | $ 2.2657 | $ 1.3594 | $ 1.8125 |  |  |
Total Dividend, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 816 |  |  |  |  |  |  |  |  |  |
Cost associated with share redemption | 1,804 | 1,804 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,804 |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units exchanged for Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 535,026 | 125,784 | 27,586
Noncontrolling interest reclassified to equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,763 | 1,109 | 316
Underwritten public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,400,000 | 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total expenses related to underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 127 | 2,370 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,715 | 201,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of company stock issuable under an at-the-market offering |  |  | 12,500,000 | 10,000,000 |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of company common stock |  |  |  |  | 1,532,598 | 115,856 | 5,469,767 |  | 875,402 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Common Stock Issuance ATM or DRIP |  |  |  |  | 18,063 | 1,391 | 44,117 |  | 5,970 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale agent commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 369 | 28 | 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross sale proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares awarded to directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,567 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock approx fair value |  |  |  |  |  |  |  |  | $ 128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 7 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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