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Summary of Average Taxable Nature of Common Stock and Series A Cumulative Redeemable Preferred Dividends (Detail) (USD $)	12 Months Ended
	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%

X

- Definition

Dividend Rate, Percentage

+ References

No definition available.

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- Details

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X

- 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

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- Definition

Aggregate dividends paid during the period for each share of preferred stock outstanding.

+ References

No definition available.

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