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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Aug. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Private Offering [Member]
Jul. 31, 2011
Private Offering [Member]
Jul. 29, 2011
Private Offering [Member]
Jul. 25, 2011
Private Offering [Member]
Dec. 31, 2012
Follow-on public offering [Member]
Oct. 31, 2012
Follow-on public offering [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Public Offering [Member]
Aug. 01, 2012
Series A Preferred Stock [Member]
Public Offering [Member]
Class of Stock [Line Items]                        
Common stock, shares authorized   450,000,000 450,000,000                  
Common stock, par value   $ 0.01 $ 0.01   $ 16.66     $ 16.81 $ 16.81      
Preferred stock, shares authorized   50,000,000 50,000,000                  
Preferred stock, par value   $ 0.01 $ 0.01                  
Common stock shares issued   28,044,106 20,561,032   3,000,000       7,000,000      
Common stock, shares outstanding   28,044,106 20,561,032                  
Preferred stock shares issued   3,450,000 3,450,000                 3,450,000
Preferred stock, shares outstanding   3,450,000 3,450,000                  
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 the offering               $ 124,066   $ 83,199    
Shares issued to the underwriters option to purchase additional shares               404,640        
Selling commission per share       $ 0.33                
Net proceeds per share before offering expenses       $ 16.33                
Premium percentage over closing price       4.65%                
Closing price per share             $ 15.92          
Net proceeds before offering expenses           48,980            
Aggregate percent of holdings   15.00%                    
Share Repurchase $ 35,000,000