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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Class of Stock [Line Items]            
Dividends per common share $ 0.225 $ 0.23 $ 0.20 $ 0.45 $ 0.35  
Preferred stock, outstanding   0   0   0
Common Stock [Member]
            
Class of Stock [Line Items]            
Record date of dividend payable May 17, 2013          
Date of dividend payable Jun. 21, 2013          
Series A Preferred Stock [Member]
            
Class of Stock [Line Items]            
Preferred stock, outstanding   191,750   191,750    
Shares of Series A Preferred converted   18,805   49,432    
Series A Preferred Stock [Member] | June [Member]
            
Class of Stock [Line Items]            
Record date of dividend payable       Jul. 01, 2013    
Date of dividend payable       Jul. 29, 2013    
Declared cash dividend on Series A Preferred shares       $ 0.05833    
Series A Preferred Stock [Member] | July [Member]
            
Class of Stock [Line Items]            
Record date of dividend payable       Aug. 01, 2013    
Date of dividend payable       Aug. 27, 2013    
Declared cash dividend on Series A Preferred shares       $ 0.05833    
Series A Preferred Stock [Member] | August [Member]
            
Class of Stock [Line Items]            
Record date of dividend payable       Sep. 03, 2013    
Date of dividend payable       Sep. 27, 2013    
Declared cash dividend on Series A Preferred shares       $ 0.05833