Preferred Dividend - Additional Information (Detail) (Series G Preferred Stock, USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend rate			10.00%
Percentage of closing price of common stock	90.00%		90.00%
Number of trading days			10 days
Dividends paid	$ 374,900	$ 312,150	$ 1,118,800	$ 739,450

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration