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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
May 31, 2013
Common Stock [Member]
Mar. 31, 2013
Common Stock [Member]
Follow-on public offering [Member]
Nov. 30, 2012
Common Stock [Member]
Follow-on public offering [Member]
Oct. 31, 2012
Common Stock [Member]
Follow-on public offering [Member]
Nov. 30, 2012
Common Stock [Member]
Underwriters Option [Member]
Jul. 31, 2013
Common Stock [Member]
July 2013 Repurchase Program [Member]
Aug. 31, 2012
Series A Preferred Stock [Member]
Aug. 31, 2012
Series A Preferred Stock [Member]
Public Offering [Member]
Dec. 31, 2013
Series A Preferred Stock [Member]
Public Offering [Member]
Aug. 31, 2012
Series A Preferred Stock [Member]
Public Offering Underwriters Option [Member]
Class of Stock [Line Items]                        
Common stock, shares authorized 450,000,000 450,000,000                    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01   $ 16.90   $ 16.81 $ 16.81          
Preferred stock, shares authorized 50,000,000 50,000,000                    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01                    
Common stock shares issued 36,888,467 28,044,106                    
Common stock, shares outstanding 36,888,467 28,044,106                    
Preferred stock shares issued 3,450,000 3,450,000                    
Preferred stock, shares outstanding 3,450,000 3,450,000                    
Issuance of stock, Shares       8,805,000   7,000,000 404,640     3,450,000    
Net proceeds from common offerings       $ 148,333 $ 124,066              
Stock offering, authorized amount     100,000                  
Share Repurchase               50,000        
Dividend rate of Series A Cumulative Redeemable Perpetual Preferred Stock                     8.625%  
Liquidation preference                   $ 25.00    
Shares issued to the underwriters option to purchase additional shares                       450,000
Net proceeds from preferred offering                 $ 83,199