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Stockholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 15, 2017
Mar. 14, 2017
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class of Stock [Line Items]              
Common stock, shares authorized (in shares)     450,000,000 450,000,000   450,000,000  
Common stock, par value (in dollars per share)     $ 0.01 $ 0.01   $ 0.01  
Preferred stock, shares authorized (in shares)     50,000,000 50,000,000   50,000,000  
Preferred stock, par value (in dollars per share)     $ 0.01 $ 0.01   $ 0.01  
Common stock, shares issued (in shares)     105,437,919 91,422,676   105,437,919  
Common stock, shares outstanding (in shares)     105,437,919 91,422,676   105,437,919  
Dividend declared per share of common stock (in dollars per share)     $ 0.46   $ 0.46 $ 0.92 $ 0.92
Proceeds from issuance of common stock as a result of follow-on public offering     $ 248,900 $ 177,796      
Common Stock [Member]              
Class of Stock [Line Items]              
Dividend declared per share of common stock (in dollars per share) $ 0.46 $ 0.46          
Series A Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)     3,450,000 3,450,000   3,450,000  
Preferred stock, shares outstanding (in shares)     3,450,000 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 0.5391          
Series B Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)     8,000,000 8,000,000   8,000,000  
Preferred stock, shares outstanding (in shares)     8,000,000 8,000,000   8,000,000  
Dividend declared per share of preferred stock (in dollars per share) 0.5000 0.50          
Series C Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)     6,900,000 6,900,000   6,900,000  
Preferred stock, shares outstanding (in shares)     6,900,000 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 $ 0.5000          
Common Stock [Member]              
Class of Stock [Line Items]              
New issuance of stock (shares)           13,800,000  
Common Stock [Member] | Follow On Public Offering [Member]              
Class of Stock [Line Items]              
New issuance of stock (shares)     13,800,000 10,500,000      
Price per share of newly issued stock (in dollars per share)     $ 18.05 $ 16.97   $ 18.05