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Stockholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 21, 2015
Sep. 09, 2015
Jul. 28, 2015
Jun. 09, 2015
Apr. 28, 2015
Mar. 16, 2015
Feb. 25, 2015
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Class of Stock [Line Items]                        
Proceeds from issuance of common stock as a result of follow-on public offering                 $ 193,148      
Placement agent fees paid                     $ 956 $ 308
Payments for repurchase of common stock                     $ 1,741 $ 0
Dividend declared per share of common stock (in dollars per share)               $ 0.44   $ 0.40 $ 1.32 $ 1.2
Common Stock [Member]                        
Class of Stock [Line Items]                        
Dividend declared per share of common stock (in dollars per share)     $ 0.44   $ 0.44   $ 0.44          
Series A Preferred Stock [Member]                        
Class of Stock [Line Items]                        
Dividend rate, preferred stock                     8.625%  
Dividend declared per share of preferred stock (in dollars per share)   $ 0.5391   $ 0.5391   $ 0.5391            
Follow On Public Offering [Member] | Common Stock [Member]                        
Class of Stock [Line Items]                        
New issuance of stock (shares)                 11,500,000      
Price per share of newly issued stock (in dollars per share)                 $ 16.82      
Private Offering [Member] | Series B Preferred Stock [Member]                        
Class of Stock [Line Items]                        
New issuance of stock (shares) 8,000,000                      
Price per share of newly issued stock (in dollars per share) $ 24.71                      
Dividend rate, preferred stock 8.00%                      
Liquidation preference (in dollars per share) $ 25.00                      
Proceeds from private offering $ 346,855                      
Placement agent fees paid $ 500                      
Common Stock [Member]                        
Class of Stock [Line Items]                        
Stock repurchased during period (shares)               107,432     107,432  
Average price of stock repurchased during period (in dollars per share)               $ 16.20        
Payments for repurchase of common stock               $ 1,741        
Common Stock [Member] | Common Stock [Member]                        
Class of Stock [Line Items]                        
New issuance of stock (shares)                     20,323,529  
Common Stock [Member] | Private Offering [Member]                        
Class of Stock [Line Items]                        
New issuance of stock (shares) 8,823,529                      
Price per share of newly issued stock (in dollars per share) $ 17.00