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Stockholders' Equity (Detail) (USD $)	3 Months Ended		0 Months Ended		3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Feb. 27, 2013 Common Stock [Member]	Mar. 15, 2013 Series A Preferred Stock [Member]	Mar. 31, 2014 Series A Preferred Stock [Member]
Class of Stock [Line Items]
Dividend declared per share of common stock	$ 0.40	$ 0.40	$ 0.40
Dividend rate, preferred stock					8.625%
Dividend declared per share of preferred stock				$ 0.5391

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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

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The percentage rate used to calculate dividend payments on preferred stock.

+ References

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

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