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Stockholder's Equity - Preferred Stock (Detail) (Series A Preferred Stock [Member], USD $) | 0 Months Ended
--- | ---
Dec. 09, 2013 | Sep. 16, 2013 | Jun. 12, 2013 | Mar. 15, 2013 | Dec. 13, 2012 | Sep. 13, 2012
Series A Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividend Amount | $ 0.5391 | $ 0.5391 | $ 0.5391 | $ 0.5391 | $ 0.5391 | $ 0.4432

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of preferred stock outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration