Preferred Shares - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		9 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended
	Feb. 15, 2014	Jan. 23, 2009	Sep. 30, 2014	Jan. 23, 2009	Jul. 03, 2012 Series A Preferred Stock [Member]	Sep. 05, 2012 Series A Preferred Stock [Member]	Dec. 19, 2013 Depositary Shares [Member]	Dec. 19, 2013 Depositary Shares [Member]	Dec. 19, 2013 Series B Preferred Stock [Member]
Preferred Stock [Line Items]
Newly issued shares		23,184					1,000,000
Number of shares issued and sold to Treasury				23,184
Liquidation preference as per securities purchase agreement				$ 1,000				$ 1,000
Warrant sold to purchase common shares as per securities purchase agreement				469,312
Warrant exercise price per common share				$ 7.41
Term of Warrant			10 years
Cumulative dividend rate per annum on liquidation preference, first five years			5.00%
Cumulative dividend rate per annum on liquidation preference, after five years			9.00%
Numbers of shares to redeem					23,184
Aggregate purchase price of warrant						$ 563
Percentage of ownership Interest								2.50%
Dividend on preferred stock									6.50%
Share issued price per share								$ 25.00
Gross proceeds from public offering							25,000
Aggregate purchase price of Preferred stock	$ 22,857
Preferred stock redemption date	Feb. 15, 2014