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Preferred Shares - Additional information (Detail) - USD ($)
Feb. 15, 2014
Dec. 19, 2013
Depositary Shares [Member]    
Preferred Stock [Line Items]    
Newly issued shares   1,000,000
Percentage of ownership Interest   6.50%
Share issued price per share   $ 25.00
Gross proceeds from public offering   $ 25,000,000
Series B Preferred Stock [Member]    
Preferred Stock [Line Items]    
Preferred shares, liquidation preference   $ 1,000
Dividend on preferred stock   6.50%
Series A Preferred Stock [Member]    
Preferred Stock [Line Items]    
Aggregate purchase price of Preferred stock $ 22,857,000  
Preferred stock redemption date Feb. 15, 2014