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Income Taxes - Federal Income Tax Treatment of Share Distributions (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2013 Common Stock | 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] | 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] | Dec. 31, 2012 Depositary Shares [Member] Series J Preferred Stock [Member]
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary Income |  | $ 0.3088 |  |  | $ 0.5085 | [1] | $ 0.0000 | $ 0.3130 |  | $ 0.9969 | [2] | $ 0.0000 | $ 0.3130 | $ 0.0000 | [3]
Long-term Capital Gains |  | $ 0.0000 |  |  | $ 0.0000 | [1] | $ 0.8025 | $ 0.0000 |  | $ 0.0000 | [2] | $ 0.8025 | $ 0.0000 | $ 0.7864 | [3]
Unrecaptured Section 1250 Gain |  | $ 0.0000 |  |  | $ 0.0000 | [1] | $ 0.0000 | $ 0.0000 |  | $ 0.0000 | [2] | $ 0.0000 | $ 0.0000 | $ 0.0000 | [3]
Return of Capital |  | $ 0.0000 |  |  | $ 0.0000 | [1] | $ 1.4632 | $ 1.0402 |  | $ 0.0000 | [2] | $ 1.4632 | $ 1.0402 | $ 1.4339 | [3]
Qualified Dividends |  | $ 0.0000 |  |  | $ 0.0000 | [1] | $ 0.0000 | $ 0.0062 |  | $ 0.0000 | [2] | $ 0.0000 | $ 0.0062 | $ 0.0000 | [3]
Preferred Distribution per Depositary Share |  | $ 0.3088 | $ 0.407812 | $ 0.055382 | $ 0.5085 | [1] | $ 2.2657 | $ 1.3594 | $ 0.090625 | $ 0.9969 | [2] | $ 2.2657 | $ 1.3594 | $ 2.2203 | [3]
Ordinary Income as a Percentage of Distribution |  | 100.00% |  |  | 100.00% | [1] | 0.00% | 23.02% |  | 100.00% | [2] | 0.00% | 23.02% | 0.00% | [3]
Long-term Capital Gains as a Percentage of Distribution | 35.42% | 0.00% |  |  | 0.00% | [1] | 35.42% | 0.00% |  | 0.00% | [2] | 35.42% | 0.00% | 35.42% | [3]
Unrecaptured Section 1250 Gain as a Percentage of Distribution |  | 0.00% |  |  | 0.00% | [1] | 0.00% | 0.00% |  | 0.00% | [2] | 0.00% | 0.00% | 0.00% | [3]
Return of Capital as a Percentage of Distribution | 64.58% | 0.00% |  |  | 0.00% | [1] | 64.58% | 76.52% |  | 0.00% | [2] | 64.58% | 76.52% | 64.58% | [3]
Qualified Dividends as a Percentage of Distribution |  | 0.00% |  |  | 0.00% | [1] | 0.00% | 0.46% |  | 0.00% | [2] | 0.00% | 0.46% | 0.00% | [3]
Preferred Distribution, Percentage |  | 100.00% |  |  | 100.00% | [1] | 100.00% | 100.00% |  | 100.00% | [2] | 100.00% | 100.00% | 100.00% | [3]
[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.
[3] | Schedule relates to the 2,000,000 Depositary Shares of the Series J Preferred Stock that were redeemed on December 21, 2012. The 2012 redemption had no impact on the 2011 allocation.

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