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Stockholders' Equity - Common Stock (Detail) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Nov. 04, 2013 Common Stock [Member] | Jul. 31, 2013 Common Stock [Member] | May 02, 2013 Common Stock [Member] | Feb. 27, 2013 Common Stock [Member] | Nov. 02, 2012 Common Stock [Member] | Aug. 06, 2012 Common Stock [Member] | May 03, 2012 Common Stock [Member] | Feb. 28, 2012 Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Amount | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40

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- Definition Aggregate dividends declared 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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