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Stockholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 14, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)   450,000,000 450,000,000  
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01  
Preferred stock, shares authorized (in shares)   50,000,000 50,000,000  
Preferred stock, par value (in dollars per share)   $ 0.01 $ 0.01  
Common stock, shares issued (in shares)   91,621,274 91,422,676  
Dividend declared per share of common stock (in dollars per share)   $ 0.46   $ 0.46
Proceeds from issuance of common stock as a result of follow-on public offering     $ 177,796  
Common Stock [Member]        
Class of Stock [Line Items]        
Dividend declared per share of common stock (in dollars per share) $ 0.46      
Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, shares issued (in shares)   3,450,000 3,450,000  
Dividend rate, preferred stock   8.625%    
Dividend declared per share of preferred stock (in dollars per share) 0.5391      
Series B Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, shares issued (in shares)   8,000,000 8,000,000  
Dividend declared per share of preferred stock (in dollars per share) 0.50      
Series C Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, shares issued (in shares)   6,900,000 6,900,000  
Dividend rate, preferred stock   8.00%    
Dividend declared per share of preferred stock (in dollars per share) $ 0.5000      
Common Stock [Member] | Follow On Public Offering [Member]        
Class of Stock [Line Items]        
New issuance of stock (shares)     10,500,000  
Price per share of newly issued stock (in dollars per share)     $ 16.97