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Regular Quarterly Distributions Declared and Paid to Common Stockholders and Common OP Unit Non-Controlling Interests (Detail) (USD $) | 3 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
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Amount Per Share | $ 0.3250 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.3250 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.3250 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.3250 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2500 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2500 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2500 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2500 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2188 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2188 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2188 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2188 us-gaap_CommonStockDividendsPerShareCashPaid
Stockholder Record Date | Dec. 26, 2014 | Sep. 26, 2014 | Jun. 27, 2014 | Mar. 28, 2014 | Dec. 27, 2013 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 28, 2013 | Dec. 14, 2012 | Sep. 28, 2012 | Jun. 29, 2012 | Mar. 30, 2012
Payment Date | Jan. 09, 2015 | Oct. 10, 2014 | Jul. 11, 2014 | Apr. 11, 2014 | Jan. 10, 2014 | Oct. 11, 2013 | Jul. 12, 2013 | Apr. 12, 2013 | Dec. 28, 2012 | Oct. 12, 2012 | Jul. 13, 2012 | Apr. 13, 2012

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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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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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