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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 01, 2012 Maximum | Feb. 28, 2011 Maximum | Dec. 31, 2013 ATM [Member] | Dec. 31, 2012 ATM [Member] | Dec. 31, 2011 ATM [Member] | May 27, 2004 Series F Preferred Stock | Dec. 31, 2013 Series F Preferred Stock | Dec. 31, 2013 Series F Preferred Stock | Dec. 31, 2013 Series F Preferred Stock Minimum | May 27, 2004 Series G Preferred Stock [Member] | Dec. 31, 2013 Series G Preferred Stock [Member] | Dec. 31, 2013 Series G Preferred Stock [Member] Scenario, Forecast [Member] | Dec. 31, 2013 Common Stock | Dec. 31, 2012 Common Stock | Dec. 31, 2011 Common Stock | Mar. 01, 2012 Common Stock ATM [Member] | Feb. 28, 2011 Common Stock ATM [Member] | Apr. 11, 2013 Series J Preferred Stock [Member] | Jan. 13, 2006 Series J Preferred Stock [Member] | Dec. 31, 2013 Series J Preferred Stock [Member] | Jun. 30, 2012 Series J Preferred Stock [Member] | Dec. 31, 2013 Series J Preferred Stock [Member] | Dec. 31, 2012 Series J Preferred Stock [Member] | Dec. 31, 2011 Series J Preferred Stock [Member] | Aug. 21, 2006 Series K Preferred Stock [Member] | Sep. 30, 2013 Series K Preferred Stock [Member] | Dec. 31, 2013 Series K Preferred Stock [Member] | Dec. 31, 2012 Series K Preferred Stock [Member] | Dec. 31, 2011 Series K Preferred Stock [Member] | Jul. 18, 2013 Series K Preferred Stock [Member] | Dec. 31, 2013 Convertible Common Stock [Member] | Dec. 31, 2012 Convertible Common Stock [Member] | Dec. 31, 2011 Convertible Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DepositarySharePercentagePerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.065% | 6.065% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.00 | $ 1,000.00 |  |  |  | $ 1,000.00 |  |  |  |  |  | $ 25.00 | $ 25.00 | $ 25.00 |  | $ 25.00 |  |  |  |  |  | $ 25.00 |  |  |  | $ 25.00 |  |  |
Aggregate redemption price | $ (150,051,000) |  |  |  | $ (50,044,000) |  |  |  | $ (150,051,000) | $ (50,044,000) |  |  |  |  |  |  |  | $ 50,000,000 | $ 50,000,000 |  |  |  | $ 25,000,000 |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Dividend equivalent to per depositary share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rates during floating rate periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption date of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.3088 |  |  |  |  |  |  | $ 0.407812 | $ 0.055382 | $ 0.5085 | [1] | $ 2.2657 | $ 1.3594 |  | $ 0.090625 | $ 0.9969 | [2] | $ 2.2657 | $ 1.3594 |  |  |  |
Total Dividend, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,000 |  | 816,000 |  |  |  |  |  |  | 181,000 |  |  |  |  |  |  |  |
Cost associated with share redemption | 0 | 2,121,000 | 3,546,000 | 0 | 1,804,000 | 0 | 0 | 0 | 5,667,000 | 1,804,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,546,000 |  | 1,804,000 |  |  |  | 2,121,000 |  |  |  |  |  |  |
Preferred stock shares authorized | 10,000,000 |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units exchanged for Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,028 | 535,026 | 125,784
Noncontrolling interest reclassified to equity |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 996,000 | 4,763,000 | 1,109,000
Underwritten public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,400,000 | 9,400,000 | 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,050,000 | 116,715,000 | 201,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of company stock issuable under an at-the-market offering |  |  |  |  |  |  |  |  |  |  |  | 12,500,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of company common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,315,704 | 1,532,598 | 115,856 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Common Stock Issuance ATM or DRIP |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,735,000 | 18,063,000 | 1,391,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross sale proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The remaining 4,000,000 Depositary Shares of the Series J Preferred Stock were redeemed on April 11, 2013. The 2013 redemption had no impact on the 2012 or 2011 allocations included in the table above.
[2] | Schedule relates to the 2,000,000 Depositary Shares of the Series K Preferred Stock that were redeemed on July 18, 2013. The 2013 redemption had no impact on the 2012 or 2011 allocations included in the table above.

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