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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | 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 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid | Jan. 07, 2014 | Oct. 08, 2013 | Jul. 02, 2013 | Apr. 02, 2013 | 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 |  |  |
Gross Ordinary Income | $ 0.000000 | $ 0.004038 | $ 0.004038 | $ 0.004038 | $ 0.003589 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.015703 | $ 0.000000 | $ 0
Capital Gain Distributions | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.018300 | $ 0.018300 | $ 0.018300 | $ 0.012200 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.000000 | $ 0.067100 | $ 0.000000
Return of Capital | $ 0.000000 | $ 0.130962 | $ 0.130962 | $ 0.130962 | $ 0.116411 | $ 0.101700 | $ 0.101700 | $ 0.101700 | $ 0.067800 | $ 0.060000 | $ 0.040000 | $ 0.040000 | $ 0.020000 | $ 0.509297 | $ 0.372900 | $ 0.160000
Total Dividends | $ 0.000000 | $ 0.135000 | $ 0.135000 | $ 0.135000 | $ 0.120000 | $ 0.120000 | $ 0.120000 | $ 0.120000 | $ 0.080000 | $ 0.060000 | $ 0.040000 | $ 0.040000 | $ 0.020000 | $ 0.525000 | $ 0.440000 | $ 0.160000

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- Definition Portion of dividend related to gross ordinary income. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + 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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- Details
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