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Preferred Shares - Additional information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
Feb. 15, 2014
Dec. 19, 2013
Sep. 30, 2015
Dec. 31, 2014
Depositary Shares [Member]        
Preferred Stock [Line Items]        
Newly issued shares   1,000,000    
Percentage of ownership Interest   2.50%    
Share issued price per share   $ 25.00    
Gross proceeds from public offering   $ 25,000    
Series B Preferred Stock [Member]        
Preferred Stock [Line Items]        
Preferred shares, liquidation preference   $ 1,000 $ 1,000 $ 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      
Preferred stock redemption date Feb. 15, 2014