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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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | 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 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid | Jan. 06, 2015 | Oct. 10, 2014 | Jul. 08, 2014 | Apr. 08, 2014 | 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 |  |  |
Gross Ordinary Income | $ 0 ddr_OrdinaryDividends | $ 0.014227 ddr_OrdinaryDividends | $ 0.014227 ddr_OrdinaryDividends | $ 0.014227 ddr_OrdinaryDividends | $ 0.012391 ddr_OrdinaryDividends | $ 0.004038 ddr_OrdinaryDividends | $ 0.004038 ddr_OrdinaryDividends | $ 0.004038 ddr_OrdinaryDividends | $ 0.003589 ddr_OrdinaryDividends | $ 0 ddr_OrdinaryDividends | $ 0 ddr_OrdinaryDividends | $ 0 ddr_OrdinaryDividends | $ 0 ddr_OrdinaryDividends | $ 0.055072 ddr_OrdinaryDividends | $ 0.015703 ddr_OrdinaryDividends | $ 0 ddr_OrdinaryDividends
Capital Gain Distributions | $ 0 ddr_CapitalGainsDividendsPerShare | $ 0.022798 ddr_CapitalGainsDividendsPerShare | $ 0.022798 ddr_CapitalGainsDividendsPerShare | $ 0.022798 ddr_CapitalGainsDividendsPerShare | $ 0.019856 ddr_CapitalGainsDividendsPerShare | $ 0 ddr_CapitalGainsDividendsPerShare | $ 0 ddr_CapitalGainsDividendsPerShare | $ 0 ddr_CapitalGainsDividendsPerShare | $ 0 ddr_CapitalGainsDividendsPerShare | $ 0.018300 ddr_CapitalGainsDividendsPerShare | $ 0.018300 ddr_CapitalGainsDividendsPerShare | $ 0.018300 ddr_CapitalGainsDividendsPerShare | $ 0.012200 ddr_CapitalGainsDividendsPerShare | $ 0.088250 ddr_CapitalGainsDividendsPerShare | $ 0 ddr_CapitalGainsDividendsPerShare | $ 0.067100 ddr_CapitalGainsDividendsPerShare
Return of Capital | $ 0 ddr_ReturnOfCapitalPerShare | $ 0.117975 ddr_ReturnOfCapitalPerShare | $ 0.117975 ddr_ReturnOfCapitalPerShare | $ 0.117975 ddr_ReturnOfCapitalPerShare | $ 0.102753 ddr_ReturnOfCapitalPerShare | $ 0.130962 ddr_ReturnOfCapitalPerShare | $ 0.130962 ddr_ReturnOfCapitalPerShare | $ 0.130962 ddr_ReturnOfCapitalPerShare | $ 0.116411 ddr_ReturnOfCapitalPerShare | $ 0.101700 ddr_ReturnOfCapitalPerShare | $ 0.101700 ddr_ReturnOfCapitalPerShare | $ 0.101700 ddr_ReturnOfCapitalPerShare | $ 0.067800 ddr_ReturnOfCapitalPerShare | $ 0.456678 ddr_ReturnOfCapitalPerShare | $ 0.509297 ddr_ReturnOfCapitalPerShare | $ 0.372900 ddr_ReturnOfCapitalPerShare
Total Dividends | $ 0 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.155000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.155000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.155000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.135000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.135000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.135000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.135000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.120000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.120000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.120000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.120000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.080000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.600000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.525000 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.440000 us-gaap_CommonStockDividendsPerShareCashPaid

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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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