Quarterly report pursuant to Section 13 or 15(d)

Mandatorily Redeemable Preferred Stock - Additional Information (Detail)

v3.3.0.814
Mandatorily Redeemable Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Feb. 29, 2012
Sep. 30, 2015
Dec. 31, 2014
Class of Stock [Line Items]      
Redeemable preferred stock, shares issued   2,150,000 2,150,000
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  
Carrying value Term Preferred Stock   $ 2 $ 2
Mandatorily Redeemable Preferred Stock [Member]      
Class of Stock [Line Items]      
Redeemable preferred stock, shares issued 1,540,000    
Redeemable preferred stock, par value $ 0.001    
Public offering price $ 25.00    
Gross proceeds of the offering $ 38,500    
Net proceeds, after deducting offering expenses $ 36,700    
Fair value of Term Preferred Stock   39,500  
Carrying value Term Preferred Stock   $ 38,500  
Closing price of Term Preferred Stock   $ 25.68  
Series C Preferred Stock [Member]      
Class of Stock [Line Items]      
Redeemable preferred stock, dividend rate percentage 7.125%    
Series C Preferred Stock [Member] | Mandatorily Redeemable Preferred Stock [Member]      
Class of Stock [Line Items]      
Redeemable preferred stock, shares issued   1,540,000 1,540,000
Redeemable preferred stock, par value   $ 0.001 $ 0.001