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Income Taxes - Summary of Tax Characterization of Common Share Dividends Per Share as Reported to Shareholders (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Preference Dividend Paid Per Share Characterized For Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid | Jan. 04, 2013 | Oct. 02, 2012 | Jul. 06, 2012 | Apr. 03, 2012 | Jan. 06, 2012 | Oct. 11, 2011 | Jul. 06, 2011 | Apr. 05, 2011 | Jan. 05, 2011 | Oct. 05, 2010 | Jul. 07, 2010 | Apr. 06, 2010 | Jan. 06, 2010 |  |  |
Gross Ordinary Income | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Capital Gain Distributions | $ 0.0000 | $ 0.0183 | $ 0.0183 | $ 0.0183 | $ 0.0122 | $ 0.0000 | $ 0.0000 | $ 0.0000 | $ 0.0000 | $ 0.0000 | $ 0.0000 | $ 0.0000 | $ 0.0000 | $ 0.0671 | $ 0.0000 | $ 0.0000
Return of Capital | $ 0.0000 | $ 0.1017 | $ 0.1017 | $ 0.1017 | $ 0.0678 | $ 0.0600 | $ 0.0400 | $ 0.0400 | $ 0.0200 | $ 0.0200 | $ 0.0200 | $ 0.0200 | $ 0.0200 | $ 0.3729 | $ 0.1600 | $ 0.0800
Total Dividends | $ 0.0000 | $ 0.1200 | $ 0.1200 | $ 0.1200 | $ 0.0800 | $ 0.0600 | $ 0.0400 | $ 0.0400 | $ 0.0200 | $ 0.0200 | $ 0.0200 | $ 0.0200 | $ 0.0200 | $ 0.4400 | $ 0.1600 | $ 0.0800

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- Definition Portion of dividend related to capital gain distributions. + References No definition available. + Details
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- Definition Dividends per share paid by an entity during the period for common stock. + References No definition available. + Details
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- Definition Portion of dividend related to gross ordinary income. + References No definition available. + Details
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- Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: 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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