Annual report pursuant to Section 13 and 15(d)

Mandatorily Redeemable Preferred Stock - Additional Information (Detail)

v2.4.0.8
Mandatorily Redeemable Preferred Stock - Additional Information (Detail) (USD $)
 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Feb. 29, 2012
Dec. 31, 2013
Dec. 31, 2012
Feb. 29, 2012
Mandatorily Redeemable Preferred Stock [Member]
Dec. 31, 2013
Mandatorily Redeemable Preferred Stock [Member]
Feb. 29, 2012
Series C Preferred Stock [Member]
Dec. 31, 2013
Series C Preferred Stock [Member]
Class of Stock [Line Items]              
Public offering of preferred stock   2,150,000 2,150,000 1,540,000      
Series C preferred stock           7.125% 7.125%
Preferred stock, par value   $ 0.001 $ 0.001 $ 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      
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            
Fair value of term preferred stock   38,500,000 38,500,000   39,500,000    
Carrying value term preferred stock   $ 2,000 $ 2,000   $ 38,500,000    
Closing price of term preferred stock         $ 25.65