Federal and State Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Auction Market Preferred Securities, Stock Series [Line Items]
Net operating loss carryforwards		$ 4,830,000
Expiration of net operating loss carryforwards	2023
Capital loss carryforwards, Expiration dates	2014 through 2015
Capital loss carryforwards	31,697,000
State and local taxes	$ 247,000	$ 234,000	$ 379,000
Minimum [Member]
Auction Market Preferred Securities, Stock Series [Line Items]
Percentage of taxable income distribute to its shareholders	90.00%