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Summary of Average Taxable Nature of Common Stock and Series A Cumulative Redeemable Preferred Dividends (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Common Stock |  |
Income Taxes [Line Items] |  |
Common dividends per share | $ 0.45 | $ 0.28
Dividend rate percentage | 100.00% | 100.00%
Common Stock | Ordinary Income |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 44.82% | 33.89%
Common Stock | Capital Gain |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 27.04% | 0.00%
Common Stock | Return of Capital |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 28.14% | 66.11%
Series A Cumulative Redeemable Preferred Stock |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 100.00% | 100.00%
Total dividends per share | $ 2.31 | $ 0.21
Series A Cumulative Redeemable Preferred Stock | Ordinary Income |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 100.00% | 100.00%
Series A Cumulative Redeemable Preferred Stock | Capital Gain |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 0.00% | 0.00%
Series A Cumulative Redeemable Preferred Stock | Return of Capital |  |
Income Taxes [Line Items] |  |
Dividend rate percentage | 0.00% | 0.00%

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- Details
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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=6959260&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
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