Quarterly report pursuant to Section 13 or 15(d)

Mandatorily Redeemable Preferred Stock - Additional Information (Detail)

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Mandatorily Redeemable Preferred Stock - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended
Feb. 29, 2012
Sep. 30, 2014
Dec. 31, 2013
Class of Stock [Line Items]      
Public offering of preferred stock   2,150,000 2,150,000
Preferred stock, par value   $ 0.001 $ 0.001
Preferred shares at a redemption price $ 25.00    
Preferred Stock redemption term   On or after January 31, 2016, we may redeem the shares at a redemption price of $25.00 per share, plus any accumulated and unpaid dividends to and including the date of redemption.  
Preferred Stock mandatory redemption date Jan. 31, 2017    
Deferred financing costs $ 1,800,000    
Carrying value term preferred stock   2,000 2,000
Mandatorily Redeemable Preferred Stock [Member]
      
Class of Stock [Line Items]      
Public offering of preferred stock 1,540,000    
Preferred stock, par value $ 0.001    
Public offering price $ 25.00    
Gross proceeds of the offering totaled 38,500,000    
Net proceeds, after deducting offering expenses 36,700,000    
Fair value of term preferred stock   40,500,000  
Carrying value term preferred stock   $ 38,500,000 $ 38,500,000
Closing price of term preferred stock   $ 26.28  
Series C Preferred Stock [Member]
      
Class of Stock [Line Items]      
Series C preferred stock 7.125%    
Series C Preferred Stock [Member] | Mandatorily Redeemable Preferred Stock [Member]
      
Class of Stock [Line Items]      
Public offering of preferred stock   1,540,000 1,540,000
Preferred stock, par value   $ 0.001 $ 0.001